A-1: Dear Daniel
Well, it has to do with accompanying yourself with one or more limbs while
soloing against it with the remaining limbs (as a pianist might play a bass
line with his left hand while playing a melody against it with his right
hand, or chords with one hand and a line with another). I do this with
ostinatos. Or , because I have a lot of toms and cymbals) I play more
melodically and harmonically at times rather than rhythmically to create a
more complete musical statement.