Musical adventurer Sandy Bull, known for his innovative work on a variety of stringed instruments, died Wednesday (April 11) in Nashville after a long illness. He was 60. Bull's experiments with acoustic guitar, captured on recordings for Vanguard in the '60s and collected in 1999 on Re-Inventions: Best of the Vanguard Years, were a seminal influence on the members of the Nitty Gritty Dirt Band, says the group's Jeff Hanna. Later, Bull picked up the oud, the electric guitar, the banjo and the pedal steel guitar. His 1996 release, Steel Tears, included songs by Hank Williams Jr., Webb Pierce and Willie Nelson, among others. Funeral arrangements are pending. Donations can be sent to the Alexander Sandy Bull Fund for Neurosurgery, c/o the M.D. Anderson Cancer Center, P.O. Box 297153, Houston, TX 77297. The donation should be earmarked for Account 8-0011804.