Hmmm, probably friends...I had a few music teachers that tuned me into some piano and cello specific stuff, that led me to search for other music, but just hearing new music my friends were listening too was a big part of it.

Acutally that's one of the first questions I ask of new acquaintances...if I ask what they listen to for music and they Lady Gaga, I know to wrap up the conversation pretty quick.