I don't tend to be so specific when picking out music. I find it easier to pick out music for levels thinking of a genre or keyword that fits in with the level. Since I don't think too specifically, it's easier for me to pick out music and find something that fits in.

Also, I select music early on in level making so I don't have to struggle with finding something that works at the very end. Instead it's easier to find music that fits the ideas/locales I want to incorperate in a level, and include whatever music I may choose early on as one of the elements to build the level around.