Shakey Graves (two songs) - Texan folk/country singer.

Red Fang (three more songs) - I guess you could call them stoner metal. They're like a less thinky Mastodon, but some of their more recent stuff (not linked) seems to be going down a more progressive route.

I found a neat little live studio album of Tower of Power recently. I can't find a good version of this album online, but here's two songs for anyone who doesn't know them, and the album is called Tower of Power Direct.

It's really clichéd for musicians to list her as an influence, but I'm currently deep in a Kate Bush phase. I must have listened to Never for Ever about five times in the last few days.