Marc's right. Lots of gospel in bluegrass. They probably sell most of their CD's at festivals. I've been to festivals all over the country and most if not all have gospel sets on Sunday morning. Lots of bluegrass bands have at least one gospel album. There aren't many bluegrass millionaires with the exception of people like Alison Krauss and maybe Del McCoury who crossed over into the main stream.

Some of the more traditional bluegrass bands stick with the old tried and true gospel songs, but the younger more contemporary bands may be open to new material and may even write it themselves.