Instrumental Duet Guitar,Instrumental Duet - Level 2 - Digital Download SKU: A0.691355 Composed by Jonathan E. Spilman. Arranged by Mark Phillips. Celtic,Folk. Score and parts. 2 pages. A. J. Cornell Publications #3384581. Published by A. J. Cornell Publications (A0.691355). Flow Gently, Sweet Afton for easy classical guitar duet (in standard notation and tablature).