I love it. The classic Borroughsian "Cut-Up" method! I wonder how man great bands have done the same for at least some of their lyrics. There are some folk who believe that the right "chunk dada dunk da donk de dunk, bwaan ahhhn bahn bum ba!" on the guitars and drums can literally save souls, and a few others beside, who believe that, properly utilized, the cut-up technique can anticipate the future. The Greeks had their "Oracle at Delphi," garage-punks and other rock n rollers have their Oracle at Gibson.
Another tip: Don't just mumble over the music. Hush it, wail it, scream it, bark at it, do whatever you have to to put a full range of vocalizations over the top of the song before you start adding too many words to the mix. I was working on one this morning and the "mumble-with-authoritah" wasn't working for me, so I started vocalizing blasts of brass, Within 10 minutes I managed to dig out a really cool verse for a new song.
