And for the record, I wouldn't call Portishead depressing, but that's just me. I think their music is absolutely beautiful.
As do I. I have all their albums.
But, come on now. Not depressing? The only songs of theirs i can think of that aren't downers are "Glory Box" and "All Mine". And that one where a black man and woman sing.
Anyhow, i found some good songs from ones listed in this topic. Still nothing quite as complicated as Portishead melodies though. Here's one i kind of like"