Instrumental Duet Instrumental Duet,Marimba,Vibraphone - Level 4 - Digital Download SKU: A0.836813 Composed by GILSON SANTOS. Concert,Contemporary,Graduation,Latin,Standards. Score and parts. 19 pages. Gilson Santos #6189255. Published by Gilson Santos (A0.836813). Afro-Brazilian music based on the main keys of Ijexá and Vassi.