It sure seems to be happeing in greater frequency. Two more music legends are gone. Chuck Brown, the godfather of go-go, died Wednesday. He was 75. This morning, Donna Summer died of cancer at her home in Florida. She was 63. Also, famed bluegrass and country-rock banjoist Doug Dillard died Wednesday night. He was 75. Over the weekend, we lost one of the greatest bass players ever: Donald "Duck" Dunn of Booker T & the MGs died in his sleep after a show in Tokyo. He was 70.