Due to their successful debut, the band’s producer was in demand, leaving little time to devote to the Prunes. The band took full advantage of the adults not being in the room and created an incredible follow-up of original material on 1968’s “Underground". Here is where the band really leaned heavily into their knack for challenging pop. This album came to define what later gravediggers of the garage genre came to devour: Iggy Pop, The Ramones, and Patti Smith all took a riff here; an attitude there.