Jethro Tull (band)

"It's always important to note for classic-rock novices that Jethro Tull is the name of the band, not the lead singer. That would be the flute-toting Ian Anderson. The band has always been innovative, even when starting with more of a blues and jazz vibe. Into the 1970s, Tull transitioned into more of a progressive but heavier sound, especially on 1971's Aqualung. The defining moment in the band's history came one year later, with the conceptually ambitious and undeniably progressive Thick as a Brick."