Trombone Solo - Level 3 - Digital Download SKU: A0.783115 By Earth Wind and Fire. By Al McKay, Allee Willis, and Maurice White. Arranged by John Groves. Funk,Hip-Hop,Pop,R & B. Individual part. 3 pages. John Groves #4996553. Published by John Groves (A0.783115). Earth Wind & Fire hit song September arranged for bass clef solo instruments Trombone or Euphonium / Baritione.