I'll Know by Frank Loesser

Overview

Key: F major · Chords used: 21 · Sections: 5

Form: A Section → A Section → Interlude → Bridge → A Section

Where these chords come from: a chord chart of this song written by a musician and shared on the iReal Pro forums, archived in the iReal Pro forum charts archived in ChoCo (de Berardinis et al., 2023). It's one musician's reading of the song, not a transcription checked against the recording. This page shows that chart as-is: the analysis below is generated directly from it by code, not written by AI. Consecutive repeats of a chord are shown once, and the piano voicings are our playable arrangement of each chord symbol, not a note-for-note transcription.

Section by section

A Section 1

• Fmaj7 – Fmaj7/E
  Imaj7 – Imaj⁴₂
• Dm7 – Gm7 – C7 – C7/B♭ – Am7 (×2)
  vi7 – ii7 – V7 – V⁴₂ – iii7
• D7♯9 – Gm7 – C7 – G♯dim – Am7 – Dm7/A – B♭maj7 – G7/B
  VI7#9 – ii7 – V7 – #ii° – iii7 – vi⁴₃ – IVmaj7 – II⁶₅
• Cmaj7 – D♭7♯11 (×2)
  Vmaj7 – bVI7#11
• C7
  V7

A Section 2

• Fmaj7 – Fmaj7/E
  Imaj7 – Imaj⁴₂
• Dm7 – Gm7 – C7 – C7/B♭ – Am7 (×2)
  vi7 – ii7 – V7 – V⁴₂ – iii7
• D7♯9 – Gm7 – C7 – G♯dim – Am7 – Dm7/A – B♭maj7 – G7/B
  VI7#9 – ii7 – V7 – #ii° – iii7 – vi⁴₃ – IVmaj7 – II⁶₅
• Cmaj7 – D♭7♯11 (×2)
  Vmaj7 – bVI7#11
• Cmaj7 – F7 – Bm7♭5 – E7♯9 – Am7 – D7♯9 – Gm7 – C7 – F69 – D7♯9
  Vmaj7 – I7 – #ivø7 – VII7#9 – iii7 – VI7#9 – ii7 – V7 – I69 – VI7#9

Interlude

• Gm7 – G♭7
  ii7 – bII7

Bridge

• Fmaj7 – Am7 – Gm7 – C7 (×2)
  Imaj7 – iii7 – ii7 – V7

A Section 3

• Fmaj7 – Fmaj7/E – Dm7 – Gm7 – C7 – C7/B♭ – Am7 – Dm7 – Gm7 – C7sus4 – C7 – C7/B♭ – Am7 – D7♯9 – Gm7 – C7 – G♯dim – Am7 – Dm7/A – B♭maj7 – G7/B
  Imaj7 – Imaj⁴₂ – vi7 – ii7 – V7 – V⁴₂ – iii7 – vi7 – ii7 – V7sus4 – V7 – V⁴₂ – iii7 – VI7#9 – ii7 – V7 – #ii° – iii7 – vi⁴₃ – IVmaj7 – II⁶₅
• Cmaj7 – D♭7♯11 (×2)
  Vmaj7 – bVI7#11
• C7 – Fmaj7 – Fmaj7/E
  V7 – Imaj7 – Imaj⁴₂
• Dm7 – Gm7 – C7 – C7/B♭ – Am7 (×2)
  vi7 – ii7 – V7 – V⁴₂ – iii7
• D7♯9 – Gm7 – C7 – G♯dim – Am7 – Dm7/A – B♭maj7 – G7/B
  VI7#9 – ii7 – V7 – #ii° – iii7 – vi⁴₃ – IVmaj7 – II⁶₅
• Cmaj7 – D♭7♯11 (×2)
  Vmaj7 – bVI7#11
• Cmaj7 – F7 – Bm7♭5 – E7♯9 – Am7 – D7♯9 – Gm7 – G♭7 – F69 – E♭7♯11 – Fmaj7
  Vmaj7 – I7 – #ivø7 – VII7#9 – iii7 – VI7#9 – ii7 – bII7 – I69 – bVII7#11 – Imaj7

Chord vocabulary

Chord	Roman numeral	Role	Heard in
Fmaj7	Imaj7	Home chord (tonic)	A Section, Bridge
Fmaj7/E	Imaj⁴₂	Home chord (tonic)	A Section
Dm7	vi7	In the key	A Section
Gm7	ii7	In the key	A Section, Interlude, Bridge
C7	V7	In the key	A Section, Bridge
C7/B♭	V⁴₂	In the key	A Section
Am7	iii7	In the key	A Section, Bridge
D7♯9	VI7#9	Secondary dominant (V/ii)	A Section
G♯dim	#ii°	Outside the key (chromatic)	A Section
Dm7/A	vi⁴₃	In the key	A Section
B♭maj7	IVmaj7	In the key	A Section
G7/B	II⁶₅	Outside the key (chromatic)	A Section
Cmaj7	Vmaj7	Outside the key (chromatic)	A Section
D♭7♯11	bVI7#11	Outside the key (chromatic)	A Section
F7	I7	Outside the key (chromatic)	A Section
Bm7♭5	#ivø7	Outside the key (chromatic)	A Section
E7♯9	VII7#9	Secondary dominant (V/iii)	A Section
F69	I69	Home chord (tonic)	A Section
G♭7	bII7	Outside the key (chromatic)	Interlude, A Section
C7sus4	V7sus4	In the key	A Section
E♭7♯11	bVII7#11	Outside the key (chromatic)	A Section

Harmonic highlights

• D7♯9 acts as V/ii: it resolves to Gm7.
• E7♯9 acts as V/iii: it resolves to Am7.

Sources & accuracy

• Chords: the iReal Pro forum charts archived in ChoCo (de Berardinis et al., 2023). Community chord chart “I'll Know-Rev JE” (credited “Loesser Frank”, style Ballad) from the forum file linked here, CC BY 4.0 via ChoCo. Performer/songwriter confirmed from Wikidata.
• Section names: from the chart's own markings: section names written on the chart (Intro, Verse, Chorus…) are kept, and rehearsal letters are shown as “A Section”, “B Section” and so on (the B of an AABA song is called the Bridge).
• Cross-check: the iReal Pro forum charts archived in ChoCo (de Berardinis et al., 2023). Community chord chart “I'll Know-Rev JE” (credited “Loesser Frank”, style Ballad) from the forum file linked here, CC BY 4.0 via ChoCo. Performer/songwriter confirmed from Wikidata. A separately posted chart of the same song; its chords match this page's closely when both are read in the same key (similarity 100%).
• Chord charts are often written in a key that suits a particular singer or band, so this may not be the key of the original recording.
• Verified: two community charts of this song, posted in different forum threads, agree on its harmony. They're still charts, not transcriptions checked against the recording.
• 17 chords were simplified to the closest symbol our player supports (for example, an unusual added tone dropped).
• Rhythm and chord durations aren't shown; each step is one chord change.