The Feelies never fail to make me feel better. It's sorta odd...I don't necessarily have "happy place" music. Even when I'm feeling crummy (or even happy) I still listen to dark or angry stuff. But for me it's about what brings me comfort.
Right now, this is what I'm feeling:
Pop Will Eat Itself -- This is the Day, This is the Hour, This is This
Pylon -- Gyrate (always lifts my spirits)
The Cure -- Pornography (you know what? When I'm feeling shitty, Robert Smith at his bleakest makes me feel so much better...he committed his darkest thoughts in the most succinct way and my shittiest day cannot match this shattering masterpiece of plunging into the depths of the human psyche. When "Cold" starts, that's the moment when I think "this man has put clinical depression to sound"...sounds like it shouldn't be comforting but it totally is. Robert Smith understands your crappy day but he will top it...every damn time.)
The Beastie Boys -- Paul's Boutique (or Check Your Head...both make me feel better)