Sooner or later, all things come around, and the Mick Fleetwood Blues Band has just released a blues album ("Blue Again") with Rick Vito , Lenny Castellanos and Mark Johnstone, and are touring until early next year, when Fleetwood Mac itself gets together again for a tour.
Here's an article from a British paper that caught my eye, with an interview with Fleetwood, now 61, and apparently enjoying a visit to his roots. Seems like soooner or later, it all goes back to the blues. Here's a video clip featuring guitarist Peter Green in that early band, probably '67 or '68. A very mellow reading of a blues ballad.
If that's not going back far enough for some blues influence, listen to yesterday's PG podcast -- "Believe Your Ears" -- in which country music critic and historian Rich Kienzle looks at some old-timey music, including blues, from Mayberry's Andy Griffith. Here's a YouTube video from an old show, with everybody singing "Boil Them Cabbage Down."