Frank Zappa

Recorded in 1970, the songs are believed to have been for a follow-up to solo debut 'Hot Rats.'

Jethro Tull leader was too embarrassed to speak to dying artist: "Each time I hung up in panic."

He also performed with Wham!, Tina Turner and others.

Shows will include new music from the late rocker, as well as former bandmates.

Their set was recorded and released, but the former Beatles star made one key change.

The album was named after one of his favorite snacks in times of hunger emergency.

Here's how the small town of Montreux, Switzerland, became a place forever linked to rock history.