Extract Chords From YouTube Videos

This is so cool!

Makes me wonder what the next step would be. Seems like they're essentially decomposing a song into its ingredients. I wonder if they could use their algorithm to convert a song from one genre to another like auto-creating the hiphop or dance version of a given song :)

This is great, wondering if there's an open source version of something like this.

Actually, they are taking a "big picture" approach, since it's easier to find out the chord produced by an unknown number of instruments than to find out how many instruments are playing and what they are playing, separately. Doing these things you describe would require the second option, I believe.

From the article itself:

“The problem with ‘full polyphonic transcription’ is that the computer doesn’t know how many voices and instruments sound together and what the characteristics are of these instruments,” says De Haas.

“When you transcribe chords, we examine the mixture as a whole and examine what the prominent frequencies are in the spectrum.”

tried to use this and the results were completely off...

BUT i was trying to use it on Moonlight In Vermont by the Johnny Smith Quintet. I am expecting that the type of harmonic structure used in the jazz chord melody style is probably beyond the current capabilities of this technology.

Even still though, i mean the results seemed to have no relation at all to teh music being played, chords were shown on silent parts of the song and vice versa.