They haven't invented GPS for music yet.  It ususally takes an artist a couple of albums to truly find their muse/groove.  Since you typically get to know a group once they're famous, it can be a revelation to work backward into their past. 

We've got wet-behind-the-ears artists Judas Priest, Scorpions, Jerry Garcia, Queen, ELO, Elton John, Bee Gees and Rod Stewart.