Dean/Cas high school AU - a band, Cas in abusive relationship?

[stormydown]

I read a Dean/Cas longish high school AU a long time ago that I haven't seen on any rec lists or anything since. Details are hazy, but I'll be as specific as I can. I remember the fic begins at a house party or something where a band is playing a show. I THINK Cas is one of the band members, and maybe Anna, but I could be wrong. Dean is at the party, and I think he and Cas end up talking by Dean's car? I believe eventually Dean wants to date Cas, but Cas is in an abusive relationship or something, maybe with Crowley. I can't really remember what happens in between all that, other than a lot of angst. Any help you could give me would be much appreciated, thanks!

EDIT: Found! Hymns of Angels Don't Sound Like This