Well good luck with Orion The Hunter Captain. Brad only sang background vocals on that album not lead vocals.
There are 3 RTZ cds, Return To Zero, Lost, and Lost And found. I didn't care much for the Delp Goudreau album, but Barry Goudreau solo album from 1980 has some great tunes with Brad on lead vocals. For example
Mean Woman Blues which would have sound right at home on any Boston album.