I had a friend like that. I suspect he got a lot of those bands through Artforum magazine.In my late teens, a had a buddy who was constantly showing me his latest cool music: Velvet Underground, Spirit, Electric Flag, and many others. I could not figure out how he found this stuff- we were together all the time and had the same group of friends, etc., so how was he doing it? Turns out that his very cool older sister (about whom I fantasized many times), who had moved to California, was sending him this stuff. She had great taste.