I've seen the performance of Suguru Goto 3 years ago in the Mapping Festival, he basically has been investigating in this kind of interfacing for years and my main problem with it was exactly that I couldn't tie, at many times, the body movements to the sound. In Suguru Goto's case, he makes contemporary dancers perform, covered in his custom built controller suits. It also did not help that the audio was actually more like a wall of noise. Some parts worked better than others, but in general I had this issue of thinking that he could have been triggering the noise himself from his computer in coordination with the dancers instead of the dancers actually triggering the sound with their movements. The show was pretty awesome tough and the suits have this Ghost in the Shell-esque vibe to them which makes them cool.
Even if the song itself is public domain (most music from the 19th century is public domain if I am not wrong), you need to clear PERFORMANCE RIGHTS for it. This means, whoever played the particular version you want to use, needs to give you clearance to use it.
I'd suggests entering a website like extrememusic.com where you can buy music tracks for your commercial projects.
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