Piano chords · Rock drive
I Don’t Know Why: piano accompaniment sheet music
Written by Dan Reynolds, Wayne Sermon & others
- A minor
- 4/4
- 117 BPM
- 2017
- Easy
Play the full song with sheet music
I Don’t Know Why written out as piano music: the bVI – i – iv – bVI loop in A minor for both hands, with chord names and finger numbers. Press play and follow the cursor. The left hand plays heartbeat octaves (rocking octaves), and the right hand sings the tune.
I Don’t Know Why chord chart
The loop once round, bar by bar, in A minor. The roman numeral says the chord's place in the key, so the same chart works in any key.
| Bar | Chord | Numeral | Notes |
|---|---|---|---|
| 1 | F | VI | F A C |
| 2 | Am | i | A C E |
| 3 | Dm | iv | D F A |
| 4 | F | VI | F A C |
What the sheet music shows
The grand staff: the right hand on the treble staff, the left hand on the bass staff, with the chord names above and a finger number on each note (1 is the thumb). It is the accompaniment: heartbeat octaves (rocking octaves) in the left hand, with the right hand free for the melody, over the F – Am – Dm – F chords.
Press play and a cursor follows the music. Above it, Colours paints each note in its key’s colour and Note names writes its letter on its head.
Play next
The same left hand: Heartbeat octaves
Questions about I Don’t Know Why
Does the sheet music for I Don’t Know Why have finger numbers?
Yes: every note of both hands has its finger number, 1 being the thumb. To read the notes alone, turn Fingers off above the music.
What chords are in I Don’t Know Why?
The loop is F – Am – Dm – F (bVI – i – iv – bVI) in A minor, and the song ends on F – G – Am.
What key is I Don’t Know Why in?
A minor, at about 117 beats a minute in 4/4.
What does the left hand play in I Don’t Know Why?
Heartbeat octaves: rocking octaves, an easy pattern. It follows the chords, so the same shape works for every bar.
Is I Don’t Know Why easy to play on piano?
Yes. Both hands play easy patterns over 4 chords. Learn the chords first, then add one hand at a time.
Made from one arrangement of this song: the left and right hands are the patterns these scores repeat most.