Omar A. Rodriguez-Lopez & John Frusciante

Omar A. Rodriguez-Lopez is the guitar player for The Mars Volta and John Frusciante is the former guitarist for the Red Hot Chili Peppers. John and Omar released a collaboration album in 2010 where fans could pay any price they wanted to download the album off Omar's official website. They help each other out and collaborate as well on both bands albums and solo work. For example you can hear John on Amputechture, the third album from The Mars Volta, he played most of the guitar parts Omar wrote.