I don't even like bluegrass that much, but I've been attending the bluegrass jams the local bluegrass society has in the park here in the summer the last three Monday nights. If your community has a bluegrass society yo might want to look into it, even if you think you're more a blues, rockabilly or country player. It's a real challenge and educational in learning to play with other people. They play in a variety of keys, often capoing way up the neck and playing G, C, or D chord positons, but they are really in B or B-flat or other keys, so you have to really learn to play by ear or recognize what a G shape is five frets up. You get to learn to walk between those chords in nearly every key, play tons of songs you have never heard before or maybe have heard but never played and learn how to keep it simple and drive the music. In Vancouver here there is nearly too many bass players unless the jam breaks up into three or four groups, but I'll bet in many places they are eager to have a bassist join them. I highly recommend it for beginners and intermediate players to broaden your skills and develop new ones.