Answers are Composers, musical terms, or instruments
20.I star as a stringed instrument, notably with G.H. (5)
22.Turn once badly when dancing to the sad, romantic music ? (8)
28.Less than influential element of scale (11)
33.Mad ring rage displayed by Aussie scorer! (8)
35.Hawaiian player made famous by a Formby man? (7)
40.Fed up with the poor soap, Ron switches to the opera (7)
42.Directs one to follow the beat (3 - 3)