Instrumental Duet Cello,Double Bass,Instrumental Duet - Level 3 - Digital Download SKU: A0.551985 Composed by James M. Guthrie. Concert,Contemporary,Instructional. Score and parts. 7 pages. Jmsgu3 #6049837. Published by jmsgu3 (A0.551985). Three movements. Score - 7 pages. Duration - 6:06.