If you like Rockabilly, be sure to catch Dr. Loen Berman, the proctologist of rock (his idea not mine), on Friday nites from 6:00 pm - 9:00 pm on KEXP.Org 90.3FM.
The shows are also archived for 2 weeks so you can stream them whenever you want. The playlists are also available for 2 weeks, so if you hear somebody you like you can find out who it is, what album it came from and what label it's on.
I listen to the Reggae program on Sat. mornings and the blues program on Sunday mornings also. If you like blues, KPLU 88.5 FM has a blues show on Sat. & Sun nites.