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I'm sorry but I'm not too great with music grammar + I'm french, so I know less about it in english. There is a real lack of documentation about which data is for, how to use it, in which purpose and so or did I miss it somewhere. For instance I don't know what is the overall key of the track, and what is it useful for, but I'm sure it is. And it's that for most of the functions (talking about Track API)

Can you point me to some definition so I'll go to sleep a bit smarter (hopefuly) :p

thanks

Hi François,

The data is usually self-explanatory, though I agree the output is not always described. It's coming. Key and pitch numbers start at C=0, C#=1, D=2, etc. Modes go 0=minor, 1=major, tatums, beats, downbeats, and sections are simple time stamps in the track, and as for segments (defined as inter onsets), there's a description in this thread. Time signature goes 3/4=3, 4/4=4 essentially. The purpose is all yours: this is descriptive data of music content. To learn about key, time signature, and other musical notations, and how to make use of them, I guess you'll have to refer to your favorite music theory or cognition books. It would be too much to explain in here. : )