What key is "That's When I Knew" in?

"That's When I Knew" by Alicia Keys is in the key of G with a tempo of 120 BPM. Difficulty: easy.

Is "That's When I Knew" easy to play on piano?

Yes — this arrangement is rated easy, meaning it uses simple chord patterns and a manageable tempo. Most beginners can play through it in 1-3 practice sessions using our color-coded notes.

Can I play "That's When I Knew" 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 "That's When I Knew"?

This arrangement of "That's When I Knew" uses 17 chords: A7, Am, Am7, Bm7, C, C7, Cm, Cmaj7, +9 more.

How long does it take to learn "That's When I Knew" on piano?

1–3 short practice sessions for the basics; 2–3 weeks to perform confidently with both hands.

What other songs by Alicia Keys can I play here?

Try "AS I AM", "DE NOVO ADAGIO (INTRO)", "TEARS ALWAYS WIN". All are available in our player with color-coded notes; pick the one matching your level.

Lyrics

Right there,

in the (D)mid dle of a con ver sa tion,

was n’t (Csus2)an y thing spe cial you said.

It was just

there.

Right then,

I did n’t (D)have time to e ven o ver think it.

I looked at you and all of a sud den

I was all

in.

It’s like my (Am)knees are all weak and them but (D7)ter flies, they were danc in’, tak in’ all of my air.

From that mo (C)ment on, it was ver (Cm)y clear.

That’s when I knew I fell in love.

That’s when I knew you were the one.

That’s when I knew you stole my (Dm7)heart a way from me.

That’s when I knew that I was sunk.

That was the mo ment that I knew I was in love.

That’s when I knew.

That day,

I did n’t (D)know where we were go in’, where the night would end.

I did n’t (Csus2)know if there was some thin’ brew in’; and if it was, I did n’t know how much I cared.

That touch,

when you (D)bare ly held my hand, I was o ver come with feel ings (Csus2)I don’t un der stand.

Not in a mil lion years, I did n’t think that we’d be here.

It’s like my (Am)knees are all weak and them but (D7)ter flies got me danc in’, tak in’ all of my air.

From that mo (C)ment on, it was ver (Cm)y, ver y, ver y, ver y clear,

oh.

That’s when I knew I fell in love.

That’s when I knew you were the one.

That’s when I knew you stole my (Dm7)heart a way from me.

That’s when I knew that I was sunk.

That was the mo ment that I knew I was in love.

That’s when I knew.

That’s when I knew, don’t you know it.

Hey,

that’s when I knew.

That’s when I knew.

That’s when I knew, ba by.

You know when you know.

You know what you feel and there’s no de ny in’ that love is for real.

There’s noth in’ to do,

just let it in.

Got to sur ren der.

That’s when I knew.

That’s when I knew we fell in (G)love.

That's When I Knew by Alicia Keys

Easy piano arrangement in the key of G at 120 BPM. Difficulty: easy. Color-coded notes — no sheet-reading skill required.

About “That's When I Knew”

What key is "That's When I Knew" in?: "That's When I Knew" by Alicia Keys is in the key of G with a tempo of 120 BPM. Difficulty: easy.
Is "That's When I Knew" easy to play on piano?: Yes — this arrangement is rated easy, meaning it uses simple chord patterns and a manageable tempo. Most beginners can play through it in 1-3 practice sessions using our color-coded notes.
Can I play "That's When I Knew" 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 "That's When I Knew"?: This arrangement of "That's When I Knew" uses 17 chords: A7, Am, Am7, Bm7, C, C7, Cm, Cmaj7, +9 more.
How long does it take to learn "That's When I Knew" on piano?: 1–3 short practice sessions for the basics; 2–3 weeks to perform confidently with both hands.
What other songs by Alicia Keys can I play here?: Try "AS I AM", "DE NOVO ADAGIO (INTRO)", "TEARS ALWAYS WIN". All are available in our player with color-coded notes; pick the one matching your level.