Run-D.M.C., "Dumb Girl"
This song is so stripped down that there aren't even any keyboards on it. Unless you count them putting "dumb" into a sampler and using that. It's proof that the alchemy of a drum machine and rapping really didn't require anything else.
Black Tusk, "Bleed On Your Knees"
Sludge metal in the vein of Mastodon or Baroness, Black Tusk do a nice job on their second album of keeping up the energy and making sure the tunes are appropriately propulsive. While maybe not as memorable as the heights of those bands, it's still fun stuff.
Ministry, "Cannibal Song"
At their peak, with The Mind Is A Terrible Thing To Taste, Ministry managed to transcend their goofy gothy roots and broke into a menacing, interesting sound. Fusing thrash with the furious synths and sampling of industrial, they sounded really badass for a couple albums. Eventually, the lyrical content and repetitiveness devolved into self-parody, but they really were genuinely good for a little while there.
Deerhunter, "Cicadas"
Not to be confused with prog rockers The Dear Hunter, Deerhunter are an experimental rock band that explores drone and pop in various ways. Shimmering and odd, I'm not sure I really love them, but they're certainly interesting. I just have this one record, Weird Era Continued.
Atmosphere, "One Of A Kind"
God Loves Ugly was the album where Atmosphere's sound really came together, and you can here is on this song: Ant's little soul samples, piano loops, and whip-crack snare and Slug's dextrous, aggressive rhymes.