Here's a rock memorabilia auction that will benefit a good cause. Rock Star Gallery, an Arizona music memorabilia museum, will auction off more than 200 lots of  music memorabilia to benefit the Children’s Cancer Center at Phoenix Children’s Hospital. The owner of the Rock Gallery, Michael Dunn is selling his collection to raise money for the hospital that saved his son from a rare form of soft tissue cancer. The auction includes autographed albums, such as the Double Fantasy album signed by John Lennon shown here, artworks by Ringo Starr and others, photographs and signed guitars from U2 and Bruce Springsteen. The auction will be conducted on April 1 and will have live online bidding. The Rock Star Gallery in Scottsdale, Arizona is currently displaying the items that will be up for bid. You can browse the online catalog here.