Thanks for the stories guys. There's a reason I asked here and didn't just google it

Requesting link to the dying, going to Valhalla and baning Freja song.

If people are doing it, it must have its merits. Sounds like it does. I can tell that working out to music (especially if you're doing cardio or variance training) really helps, but I can't imagine how singing can benefit you when you're gasping for air. Guess it just works though.