Cecil Blackwood, a gospel singer who was a member of the Blackwood Brothers and crooned with Elvis Presley, died Monday of cancer. He was 66. The Blackwood Brothers, who have won nine Grammys and 20 Dove awards, were a favorite of Elvis Presley, who briefly sang with Cecil Blackwood in a group named the Songfellows. Said Blackwoods' son-in-law, Andy Childs: ``Right now it's undecided if the group will carry on.