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Automatic Generation of Lead Sheets from Polyphonic Music Signals

Jan Weil¹, Thomas Sikora¹, Jean-Louis Durrieu², Gaël Richard²

¹Communication Systems Group
Technische Universität Berlin

²Institut Telecom
Telecom ParisTech
CNRS LTCI

A lead sheet is a type of music notation which summarizes the content of a song. The usual elements that are reproduced are the melody, chords, tempo, time signature, style and the lyrics, if any. In this paper we propose a system that aims at transcribing both the melody and the associated chords in a beat-synchronous framework. A beat tracker identifies the pulse positions and thus defines a beat grid on which the chord sequence and the melody notes are mapped. The harmonic changes are used to estimate the time signature and the down beats as well as the key of the piece. The different modules perform very well on each of the different tasks, and the lead sheets that were rendered show the potential of the approaches adopted in this paper.

This is the website accompanying the ISMIR 2009 paper.

Example lead sheets

The second column of the following tables links to the reference Lead Sheet generated by Band In A Box (BIAB); the third column points to the automatically generated Lead Sheet.

The audio result is an mp3 stereo file which is best listened to through headphones. The left channel contains the input audio signal (mixed down to a single channel); the right channel contains the resynthesized analysis results: the (unquantized) melody is syntesized using FM synthesis, chords are synthesized using Shepard tones, the detected beat is marked by a click signal, the downbeats are emphasized.

The following 11 songs were used for the melody note transcription evaluation.

Complete Examples
Song title
Original BIAB Leadsheet
Automatically Generated Leadsheet
Audio Result
Remarks
Bridge Over Troubled Water - Simon & Garfunkel
pdf (PDF, 17,8 KB)
pdf (PDF, 215,3 KB)
mp3 (MP3, 1,7 MB)
Can't Buy A Break
pdf (PDF, 47,1 KB)
pdf (PDF, 204,3 KB)
mp3 (MP3, 1,3 MB)
beat tracking failed
Careless Whisper - George Michael
pdf (PDF, 7,8 KB)
pdf (PDF, 85,1 KB)
mp3 (MP3, 549,6 KB)
Close To You - Hoffman & Livingston & Lampl
pdf (PDF, 18,0 KB)
pdf (PDF, 110,4 KB)
mp3 (MP3, 963,7 KB)
Daytripper - Beatles
pdf (PDF, 15,4 KB)
pdf (PDF, 119,0 KB)
mp3 (MP3, 669,4 KB)
Do You Want To Know A Secret - Beatles
pdf (PDF, 15,7 KB)
pdf (PDF, 155,5 KB)
mp3 (MP3, 973,5 KB)
Hard Day's Night - Beatles
pdf (PDF, 31,8 KB)
pdf (PDF, 271,6 KB)
mp3 (MP3, 1,9 MB)
Here Comes The Sun - Beatles
pdf (PDF, 18,6 KB)
pdf (PDF, 189,4 KB)
mp3 (MP3, 1,3 MB)
Hot Coffee
pdf (PDF, 26,1 KB)
pdf (PDF, 213,8 KB)
mp3 (MP3, 1,5 MB)
I'm A Believer - Monkees
pdf (PDF, 22,4 KB)
pdf (PDF, 231,6 KB)
mp3 (MP3, 1,7 MB)
Killing Me Softly With His Song
pdf (PDF, 24,5 KB)
pdf (PDF, 265,3 KB)
mp3 (MP3, 1,9 MB)



Some examples for which the melody was not estimated
Song title
Original BIAB Leadsheet
Automatically Generated Leadsheet
Audio Result
Remarks
House Of The Rising Sun - Animals
pdf (PDF, 6,5 KB)
pdf (PDF, 143,0 KB)
mp3 (MP3, 1,3 MB)
correctly identified 6/8 meter;
some major/minor chord confusions

Cats - Memory
pdf (PDF, 7,4 KB)
pdf (PDF, 127,7 KB)
mp3 (MP3, 1,7 MB)
correctly identified 6/8 meter;
pitch spelling errors as we do not consider key modulations

Database

The database is a subset of the Rock&Pop db gathered by the Yahoo Biab user group.

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