Choral Choir,Choral (TTBB) - Level 4 - Digital Download SKU: A0.1384894 By The Doobie Brothers. By Kenny Loggins and Michael McDonald. Arranged by Mitchell Bartel. A Cappella,Contemporary,Pop,Rock. 12 pages. Mitchell Bartel #968990. Published by Mitchell Bartel (A0.1384894). Low voice (TTBB) 8 part + vocal percussion a capella arrangement of What a Fool Believes by The Doobie Brothers, arranged by Mitchell Bartel.