Jazz trumpeter Donaldson "Donald" Byrd, who charted with "Black Byrd" (#88) in 1973 and also "Think Twice" (#104) in 1975, died Monday (February 4). No cause of death was disclosed for the Detroit native, who was 80. A one-time member of Art Blakey's Jazz Messengers, he is best-known in pop circles for forming the Blackbyrds while teaching jazz at Howard University in Washington, DC in the early '70s. The group reached the charts nine times from 1974 to 1978, most notably with "Walking In Rhythm" (#6-1975).