What key is "Undone - The Sweater Song" in?

"Undone - The Sweater Song" by Weezer is in the key of G with a tempo of 80 BPM. Difficulty: medium.

Is "Undone - The Sweater Song" easy to play on piano?

This arrangement is rated medium. It requires comfort with chord shapes and basic hand independence. Expect 1-2 weeks of regular practice for a confident performance.

Can I play "Undone - The Sweater Song" without reading sheet music?

Yes. Our player offers a falling-notes mode (Synthesia-style) and a beginner mode with color-coded keys — both let you play along without reading traditional notation.

What chords are used in "Undone - The Sweater Song"?

This arrangement of "Undone - The Sweater Song" uses 8 chords: Bb, Bbpow, C, Cpow, D, Eb, F, G.

How long does it take to learn "Undone - The Sweater Song" on piano?

2–4 weeks of consistent practice (20–30 min/day) for an intermediate player. Drill the tricky passages in isolation first.

What other songs by Weezer can I play here?

Try "SAY IT AIN'T SO", "MY NAME IS JONAS", "ISLAND IN THE SUN". All are available in our player with color-coded notes; pick the one matching your level.

Lyrics

I’m me, me be, God damn, I am.

I can sing and hear me, and know me.

If you (C)want to de (D)stroy my sweat er,

hold this (C)thread as I (D)walk a way.

Oh no, it go, it gone, bye bye.

Who I, I think, I sink, and I die.

If you (C)want to de (D)stroy my sweat er,

hold this (C)thread as I (D)walk a way.

Watch me un (C)rav el, I’ll (D)soon be nak (C)ed.

Ly in’ on the (C)floor, I’ve (D)come un done.

If you (C)want to de (D)stroy my sweat er,

hold this (C)thread as I (D)walk a way.

Watch me un (C)rav el, I’ll (D)soon be nak (C)ed.

Ly in’ on the (C)floor, I’ve (D)come un done.

If you (C)want to de (D)stroy my sweat er,

hold this (C)thread as I (D)walk a way.

Watch me un (C)rav el, I’ll (D)soon be nak (C)ed.

Ly in’ on the (C)floor, I’ve (D)come un done.

(D)come un done.

Ooh,

ooh,

ooh.

Ooh,

ooh,

ooh.

Ooh,

ooh,

ooh.

Ooh,

ooh,

ooh.

Ooh,

ooh,

ooh.

Ooh,

ooh,

ooh.

(G)Ooh.

Undone - The Sweater Song by Weezer

107 people have learned this song

Easy piano arrangement in the key of G at 80 BPM. Difficulty: medium. Color-coded notes — no sheet-reading skill required.

Teacher’s notes

This arrangement is a great way to build confidence with borrowed chords — you're in G major, but Bb, Eb, and F show up frequently, so your hands need to be comfortable jumping to those flat-side shapes without hesitation.

Your left hand drives an oompah bass pattern, alternating between root notes and chord tones, so lock that in hands-separate first at around 60 BPM before layering in the right hand.

The trickiest transitions are G to Bb and C to Eb, where your hand has to shift quickly without a shared pivot finger — drill just those two-chord pairs in a loop until they feel automatic.

Watch the power chord voicings too; keep them light and punchy rather than heavy.

At 80 BPM you have breathing room, so use it to land each chord cleanly.

This is the piece that'll make borrowed chords feel like home in your playing.

About “Undone - The Sweater Song”

What key is "Undone - The Sweater Song" in?: "Undone - The Sweater Song" by Weezer is in the key of G with a tempo of 80 BPM. Difficulty: medium.
Is "Undone - The Sweater Song" easy to play on piano?: This arrangement is rated medium. It requires comfort with chord shapes and basic hand independence. Expect 1-2 weeks of regular practice for a confident performance.
Can I play "Undone - The Sweater Song" without reading sheet music?: Yes. Our player offers a falling-notes mode (Synthesia-style) and a beginner mode with color-coded keys — both let you play along without reading traditional notation.
What chords are used in "Undone - The Sweater Song"?: This arrangement of "Undone - The Sweater Song" uses 8 chords: Bb, Bbpow, C, Cpow, D, Eb, F, G.
How long does it take to learn "Undone - The Sweater Song" on piano?: 2–4 weeks of consistent practice (20–30 min/day) for an intermediate player. Drill the tricky passages in isolation first.
What other songs by Weezer can I play here?: Try "SAY IT AIN'T SO", "MY NAME IS JONAS", "ISLAND IN THE SUN". All are available in our player with color-coded notes; pick the one matching your level.