for an older band, maybe The Jesus and Mary Chain

Air - Moon Safari
Red House Painters
M83
Check out a song by - The Crimea called out of africa thats a kinda moody, mellow, scratchy type tune.
Elsiane
The Most Serene Republic - a Song called "Phages" is awsome

later

If you like Mogwai, then the obvious band for you to listen to is Slint (primarily Spiderland).

I have heard a lot about SLINT. I think I will have to check them out.

Oh yes you should. Slint's Spiderland is my favorite album. Another Louisville band with a similar vibe is Rodan whose sole album Rusty is rather good.

Are you talking down tempo as in the genre, or like trip-hop (DJ Shadow, Portishead)?

^That confused me too: for instance Back in Communist Russia... were a great band and their music could be described as down-tempo, but certainly not in the manner of most trip-hop bands.

secondhand serenade is pretty depressing and "down tempo" (I guess...down tempo is a pretty subjective phrase)

okay sorry I haven't replied but I've been busy. Anyways, a better way to describe what I'm looking for is deppressing/angry "Trip-Top". It would be even better if it had some guitar in it too, but anyways, I hope that helps tell you what I'm looking for. Thanks.

Ah, Low.

The Great Destroyer is a really great album.