Honestly it's mostly about collocation, which studies have shown to be the most powerful factor in friendship formation. My best long-running friends that I'm

Honestly it's mostly about collocation, which studies have shown to be the most powerful factor in friendship formation. My best long-running friends that I'm still in regular contact with are all people that I met freshman/sophomore year of college because we lived on the same floor in the dorms. Now obviously most of the people on my floor I didn't make friends with, but I did make friends with the ones that I got along with. And yes there's some shared interests involved as part of that, but proximity was more important. I was in the CS major and I actually didn't make a lot of friends in the major at all; we didn't gel well for whatever reason and the classroom environment wasn't suitable for getting to know people. So my college friends ended up being a diversity of majors plus a lot of landscape architecture majors, because my most outgoing friend was in that major and he made a lot of friends in the major because of the nature of it (lots of time spent together in close quarters in the studio doing project work). So I wouldn't say I've explicitly made many if any friends over shared interests in music, but then once I had friends for whatever other reasons, we shared a lot of music with each other. Hardly any of them weren't "in" to music, and indeed some of them quite the opposite; they ended up in a band together (and I would occasionally incompetently noodle along with them on vocals/bass/guitar, but I wasn't remotely good enough to play out like they were).