Whenever I get like that, I go
BACKWARDS. I have a friend who owns a record store, (yep, licorice pizzas,) and we'll put on all kinds of stuff from the 30's, 40's, and 50's...I just picked-up a Sinatra collection of 16 disks in a box, (Mobile Fidelity Sound Labs, oh, yeah, baby!

) and it's
absolutely intergalactic!! My daughters aren't even sick of it yet!

Also old blues...you can't go wrong with Robert Johnson, but here's a guy that people forget about a lot, Mississippi John Hurt. The humanity that came outta that sweet, simple old man is truly astonishing. It's just his voice and (amazingly complex) nylon-string guitar

There's a 3-cd collection of his last works from Verve, highly recommended!!
Also Moby, pretty good, I hear...