Someone at rehearsal says “let’s take it in G”, the guitarist nods, the singer knows exactly what to do – and you’re quietly trying to work out what just happened. Scales and keys sound like dry textbook theory, but they’re really the language musicians use with each other. Once you speak it, songs stop being chords to memorise and become a map you can read.
This guide is for high-schoolers in bands, university students and adults returning to the keyboard. It’s exactly the material we cover with students from the Old North, Bavli and Lamed in our piano lessons in North Tel Aviv. It all starts with one formula.
The formula behind every major scale: W-W-H-W-W-W-H
On the piano, the distance between two neighbouring keys is a half step (semitone); two half steps make a whole step. Every major scale, on any instrument, follows the same pattern:
Whole – Whole – Half – Whole – Whole – Whole – Half
Start on C and climb using only the white keys: C, D, E, F, G, A, B, C. There’s no black key between E–F or B–C – those are the formula’s two half steps, which is why C major needs no black keys.
What happens when you start somewhere else?
Let’s build a scale from G. G to A (whole), A to B (whole), B to C (half), C to D (whole), D to E (whole), and now we need another whole step from E. The next white key, F, is only a half step above E – so we have to go up to F sharp (F#). From there it’s a half step to G, and the scale is complete. Result: G major has one sharp, F#.
The same process starting on D gives you two sharps, F# and C#. Starting on F gives you one flat, B flat. No memorising – just count.
Scale degrees: giving every note a number
Musicians number scale notes 1 to 7 (in C major, C = 1, D = 2…). That’s how they change key without getting lost: they think “1, 5, 6, 4”, not “C, G, A, F”.
Key signatures: how you know what key a song is in
Right after the clef on every line of sheet music you’ll see the key’s sharps or flats – the key signature. It saves writing a sharp before every F. If reading notation still feels like code-breaking, have a look at our step-by-step guide to reading sheet music first.
| Major key | Key signature | Altered notes | Relative minor |
|---|---|---|---|
| C | none | – | A minor (Am) |
| G | 1 sharp | F# | E minor (Em) |
| D | 2 sharps | F#, C# | B minor (Bm) |
| A | 3 sharps | F#, C#, G# | F# minor (F#m) |
| E | 4 sharps | F#, C#, G#, D# | C# minor (C#m) |
| F | 1 flat | Bb | D minor (Dm) |
| Bb | 2 flats | Bb, Eb | G minor (Gm) |
| Eb | 3 flats | Bb, Eb, Ab | C minor (Cm) |
Two shortcuts that save you memorising
- The order of sharps never changes: F, C, G, D, A, E, B. When a key signature has sharps, take the last one and go up a half step – that’s the key. Three sharps? The last is G#, a half step above it is A, so you’re in A major.
- The order of flats is the reverse: B, E, A, D, G, C, F. With two or more flats, the second-to-last flat names the key. Three flats (Bb, Eb, Ab)? The second-to-last is Eb, so it’s E flat major. A single flat is always F major.
The relative minor: two scales, the same notes
Every major scale has a minor “sibling” that uses exactly the same notes and the same key signature. To find it, go to the sixth degree of the major scale – or count three half steps down from the tonic: C → B → Bb → A gives A minor; from G you land on E minor.
The difference is where “home” is – the chord the song resolves to. In “Zombie” by The Cranberries the chords are Em, C, G and D – all of which belong to both G major and E minor. But the song opens on Em and keeps landing back there, which is why it feels dark and minor. That’s the relative minor at work.
It’s also why the A minor pentatonic scale works so well over a song in C major. None of this is piano-only: anyone taking guitar lessons uses the same ideas in every solo and every chord change.
The circle of fifths: a map of every key
Arrange the keys like a clock face, each step clockwise rising a fifth (seven half steps): C at 12, G at 1, D at 2, A at 3 – each step adds a sharp. Counter-clockwise – F, Bb, Eb – each step adds a flat.
Why it matters:
- Neighbours on the circle are close relatives. G major and D major differ by just one note, so moving between them sounds natural.
- The three main chords sit side by side. In C major, the I, IV and V chords are C, F and G – the tonic and its two neighbours, in every key.
- The relative minors live on the inner ring. Am sits under C, Em under G.
Try our interactive circle of fifths: click a key and you’ll see its sharps or flats and the chords that belong to it.
How to find the key of a song in five steps
Students ask for this most, because it’s instantly useful – for playing along with recordings or picking a singable key.
- Look at the last chord. Most songs end on the tonic, the “home” chord.
- Write down every chord in the song. Each major key has seven “natural” chords: major on degrees 1, 4 and 5; minor on 2, 3 and 6; diminished on 7. In G major that’s G, Am, Bm, C, D, Em, F#dim.
- Find the match. If a song uses G, C, D and Em, they all live in G major (or E minor, its relative).
- Decide between major and minor by “home”. Which chord does the song feel like it resolves to – G or Em?
- Check by singing. Hum or play the note you think is the tonic over the song. If it sounds “right” at the end of the chorus, you’ve found it.
Some songs to practise on: “Let It Be” by The Beatles is in C major (C, G, Am, F), Bob Dylan’s “Knockin’ on Heaven’s Door” is in G major, and Leonard Cohen’s original “Hallelujah” is in C major. If you also want to understand how the chords themselves are built on the keyboard, our guide to piano chords made simple completes the picture.
Piano drills: C, G and D major with the right fingering
Now for the hands. Pianists number the fingers like this: thumb = 1, index = 2, middle = 3, ring = 4, little finger = 5.
Right hand (ascending): 1-2-3-1-2-3-4-5
In C, G and D major the right-hand fingering is identical. Play three notes (1-2-3), pass the thumb under the hand to the fourth note, then carry on 2-3-4-5. Coming down it’s the exact reverse: 5-4-3-2-1, then the middle finger (3) crosses over the thumb, and you finish 2-1.
Left hand (ascending): 5-4-3-2-1-3-2-1
The left hand starts on the little finger and walks down to the thumb, then the middle finger crosses over the thumb. This is also the same in all three keys.
How to practise without getting bored
- One hand, one octave, 60 BPM in quarter notes. One note per click. Only when it’s completely clean three times in a row do you move to eighth notes.
- The thumb pass is everything. Start moving the thumb under while still playing the second note, and keep the wrist level.
- Watch the black keys. In G, F# falls on finger 4 in the right hand. In D, F# is on 3 and C# on 4. Catch a plain F? Stop and fix it.
A teacher spots a stuck thumb or a tense hand before it becomes a habit – a big advantage of piano lessons for teens and adults with a real teacher over learning from videos alone.
A weekly plan: 15–20 minutes a day
| Day | Theory (5 minutes) | Hands (10–15 minutes) |
|---|---|---|
| Sunday | Build C and G major from the formula on paper | C major, right hand, 60 BPM quarter notes |
| Monday | Write out the key signatures from the table from memory | C major left hand, then G major right hand |
| Tuesday | Find the relative minor of C, G, D and F | G major, hands separately, eighth notes at 60 |
| Wednesday | Draw the circle of fifths up to 3 sharps and 3 flats | D major, hands separately, mind both sharps |
| Thursday | Work out the key of a song you love | C major hands together, 50 BPM |
| Friday | Play the I, IV and V chords in C, G and D | Round-up: all three scales, one octave, record on your phone |
| Saturday | Rest or active listening: spot the tonic in songs | Play a favourite song in one of your new keys |
Play guitar too? The same key logic explains why one chord shape can slide up the neck and change its name – which is exactly the idea behind barre chords on the guitar.
Common mistakes
- Memorising scales as lists of notes. Know the formula and you can build any scale in seconds.
- Speeding up before the fingering is solid. A clean 60 BPM beats a messy 100 BPM.
- Confusing a major key with its relative minor. Same notes, different home. Always ask: where does the song come to rest?
- Only practising the right hand. The left hand usually lags – give it its own time.
Learning theory and piano in North Tel Aviv
At Rockstar, our music school in Ramat Aviv Gimel, theory is always taught through playing – every scale through a song the student chose. Our teachers are working musicians, and each student gets a plan that fits their pace and goals – high-schoolers preparing for their music matriculation exam, students from nearby Tel Aviv University, or adults from Yisgav and New Lamed who finally want to understand what they’re playing. If that sounds like you, take a look at our piano lessons in Ramat Aviv Gimel and book a free, no-commitment intro lesson.
FAQ
How long does it take to understand scales and keys?
You can understand the formula and the basic key signatures in two or three weeks of short daily practice. Feeling keys by ear takes a few months, and keeps growing for years.
Which scale should I start with?
C major – no black keys, so you can focus on fingering. Then G and D: same fingering, one more sharp each.
Is this relevant for guitar, bass and singing too?
Absolutely. The same theory applies everywhere: guitarists use it for solos, bassists for lines, singers to choose a key that suits their voice.
Where can I learn piano and music theory in North Tel Aviv?
At Rockstar’s music school in Ramat Aviv Gimel, a short drive from the Old North (HaTzafon HaYashan), Bavli, Lamed, New Lamed and Yisgav. If you’d rather learn at home, you can ask about Rockstar Home lessons – subject to teacher availability in your area. You’ll find more about the neighbourhood on our page about music lessons in Lamed, Tel Aviv.
Read also: A Smart 20-Minute Practice Routine · How to Sing in Tune · How to Solo Like David Gilmour · Piano Hand Independence
Piano lessons · All lessons · Contact us · Book a free intro lesson