Power Pop is a cross between the crunching hard rock of the Who and the sweet melodicism of the Beatles and Beach Boys, with the ringing guitars of the Byrds thrown in for good measure. Although several bands of the early '70s -- most notably the Raspberries, Big Star, and Badfinger -- established the sound of power pop, it wasn't until the late '70s that a whole group of like-minded bands emerged. Most of these groups modeled themselves on the Raspberries (which isn't entirely surprising, since they were the only power-pop band of their era to have hit singles), or they went directly back to the source and based their sound on stacks of British Invasion records. What tied all of these bands together was their love of the three-minute pop single.