ROBERT TERRY GIDCUMB, 50, of St. Petersburg, died Saturday (Oct. 23, 1993) at Edward White Hospital. He came here in 1959 from his native Detroit. He was a drummer and singer for bands throughout Florida for 35 years. Survivors include his wife, Chadelyn P.; a son, Michael F., St. Petersburg; a stepson, Dale Harrod, Coral Springs; a daughter, Pamela Gidcumb, Fort Lauderdale; and a brother, Earl E., Wickliffe, Ky.