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Comment by apalmer | Hacker News Reader

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.

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fwiw, this uses software [1] that has dozens of dials to adjust yet not giving access to those dials. That's probably why. One of the key challenges (i've tried to write chord detectors personally) is that different instruments sounds have different harmonic falloff rates (in different frequency ranges no less).

[1] http://isophonics.net/nnls-chroma

I think you nailed it. Yes, the algorithms can't figure out all the proper tuning yet.

For instance, the lowest frequency (among the strongest amplitude candidates) is often the bass line, & thus the chord. However, those type of general rules are common, yet often broken to make the music more interesting in the first place. Esp. when notes are "left out" to open things up & let you mind fill it in.

Agreed, it' say really cool idea, so I thought I would try it out with something relatively simple - Adele's Skyfall.

The results seem hit and miss - consecutive lines with the same chord structure appear to me transcribed differently

http://chordify.net/chords/adele-skyfall-lyric-video-adeleve...

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