Classic rock artists may not get much love on top 40 radio anymore, but that doesn't mean no one's listening to their music. Quite the contrary.
According to Pollstar's mid-year report of worldwide concert grosses, some of the most popular tours of 2011 are being led by older rock acts.
When they entered the studio to work on songs for a follow-up to 2009's 'Volume 4: Songs in the Key of Love & Hate,' Puddle of Mudd had a hard time finding the inspiration for new material -- so they decided just to have fun playing some of their favorite tunes by other artists.
"We were really burned out, and when we started trying to write again it just wasn’t time yet," said guita