1) youtube recommendations (I provided enough data for them to be good) 2) contextual discovery - e.g. I like some band and than I discover the previous band o

1) youtube recommendations (I provided enough data for them to be good) 2) contextual discovery - e.g. I like some band and than I discover the previous band of their drummer 3) recommendations from friends, internet radio DJs etc 4) accidentally visiting band's concert