Well, although he's been mentioned, and although it's really beyond basic stuff, John Paul Jones is really one to check out. He not only plays within the blues idiom, but was really something of a master blues bass improviser, never just playing the line, but including all kinds of variations (slides, hammer-ons, etc ). For a great example of the kind of blues bass that comes closer to jazz in not playing straight, check out that Zeppelin "Lemon Song" on Zeppelin II! There's also a transcription of the song on "Led Zeppelin I & II" (no tab, though) where you'll read a bassist who's really getting into and having fun with the blues structure! Also, you'll find yourself bored silly once you see how simple the bassic styles are - check out that Friedland blues bass book and move on fast: listen and learn the blues scales, especially the major and minor, and get creative! The scales themselves sound musical, too. Another great book is the Berklee Press' "Blues Improvisation for C Bass Instruments", because you'll get into the deeper things that'll make playing that there thang more fun eventually. Oh! And you GOTTA check out Columbia's "The Compete Jack Johnson Sessions" for some really RAW electric blues variations by Dave Holland and Michael Henderson - granted, it IS jazz, and yeah, they kinda get WAY out on some cuts, but man, there are some real cold pieces up on that collection that give some great ideas about freedom in form! All IMHO two cents s**t, sorry - recommendations from a really excited newbie to the forums!