Cool music! 
I love the idea of combining music with comics, I for one listen to specific genres when I'm creating certain comic scenes, and I've been thinking of adding tracks from Soundcloud to my pages here on Tapastic too.
However- there are a few problems. Namely, it can be really hard to read a page and concentrate on it with music in the background, especially the more energetic music with lyrics. This is one reason I haven't added any music to my comic yet. It can be done well, depending on how text heavy or complicated a page is. Subtle background ambient music may be easier to read to.
Still, every comic is different and what works for one may not work for another! I really like the vibes I'm getting from this, the music definitely adds to the atmosphere.