anyway... i've read that playing in "parallel
thirds" (or fifths) is a good way to play
accompaniment. and get a horn-section like sound. my
band make-up is guitar, piano, bass, drums, harp, and
vocal. so, say, if my guitarist (or piano player) is
playing a riff like D F G (over the I chord in G) and
i play F Ab Bb and we play the line in unison, is that
kind of the idea? what if i play that line over the G
chord but i don't have anyone paralleling me with the
accompanying riff, could that still work? wouldn't it
just sound like i'm playing the riff in the wrong key?