I enjoy bluegrass and particularly some of the newer artists grouded in the "old timey" traditions. You have some great suggestions listed above and will find some of the best quality recordings from this group:
Ralph Stanley
Del McCoury I like "Del and the Boys" He also has a recent greatest hits collection.
Infamous Stringdusters
The Steeldrivers
Nicklecreek/ Chris Thiel the best mandolin player on the planet
Mark O'Connor he plays in several genres, but his fiddle/bluegrass recordings are great.
believe it or not, Steve Martin's latest bluegrass cd is good.
Ralph Stanley
Del McCoury I like "Del and the Boys" He also has a recent greatest hits collection.
Infamous Stringdusters
The Steeldrivers
Nicklecreek/ Chris Thiel the best mandolin player on the planet
Mark O'Connor he plays in several genres, but his fiddle/bluegrass recordings are great.
believe it or not, Steve Martin's latest bluegrass cd is good.