"Riveter" [5.2 MB .mp3].
This piece is constructed from overlayed (licensed) midi demos from a couple of different genres; the samples are from an 80s style drum machine but the most interesting, sculpted notes come from Native Instruments' "Machine Kit," sound design by Smyglyssna (who makes music, too). Layering rhythmically incompatible midi files together initially sounds confusing and not too enjoyable, so the "art" is separating the midi files by pitch and spreading them around over several minutes' playing time in a proportioned Steve Reichian sort of way, giving each sound the maximum space and "surprise value" as it is introduced.
This is part art, part (hackless) game modding, but also a kind of reporting: many of the licensed sounds used are state of the art electronic noises, elaborately manufactured and processed as described in the NI product notes and meant to be used in every kind of music production from TV soundtracks to the basement-made dance music. They aren't that interesting when you just hit "note on," though--someone has to write tunes for them, or put the art frame around them so you can hear them with greater delectation.