Interplay by Bill Evans

Overview

Key: F minor · Chords used: 10 · Sections: 1

Form: 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

• Fm6 – B♭m6 – Fm6 – F7♭9 – B♭m7 – Fm6 – A♭7 – Gm7♭5 – Caug7 – Fm6 – Dm7♭5 – C♯maj7 – F♯maj7
  i6 – iv6 – i6 – I7b9 – iv7 – i6 – bIII7 – iiø7 – V+7 – i6 – viø7 – #Vmaj7 – #Imaj7

Chord vocabulary

Chord	Roman numeral	Role	Heard in
Fm6	i6	Outside the key (chromatic)	A Section
B♭m6	iv6	In the key	A Section
F7♭9	I7b9	Secondary dominant (V/iv)	A Section
B♭m7	iv7	In the key	A Section
A♭7	bIII7	Outside the key (chromatic)	A Section
Gm7♭5	iiø7	In the key	A Section
Caug7	V+7	In the key	A Section
Dm7♭5	viø7	Outside the key (chromatic)	A Section
C♯maj7	#Vmaj7	In the key	A Section
F♯maj7	#Imaj7	Outside the key (chromatic)	A Section

Harmonic highlights

• F7♭9 acts as V/iv: it resolves to B♭m7.

Sources & accuracy

• Chords: the iReal Pro forum charts archived in ChoCo (de Berardinis et al., 2023). Community chord chart “Interplay” (credited “Evans Bill”, style Medium Swing) from the forum file linked here, CC BY 4.0 via ChoCo. Performer/songwriter confirmed from Wikidata.
• Section names: the chart has no section markings, so sections were detected by code from repeated 8-, 12- and 16-bar phrases (letters such as A and B mark different phrases).
• Cross-check: the iReal Pro forum charts archived in ChoCo (de Berardinis et al., 2023). Community chord chart “Interplay” (credited “Evans Bill”, style Medium Swing) 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.
• About the song: Wikipedia.
• 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.
• Rhythm and chord durations aren't shown; each step is one chord change.