Solo Guitar - Level 4 - Digital Download SKU: A0.881522 Composed by Robert S. Wallace, II. 20th Century,Romantic Period. Individual part. 10 pages. Robert Wallace, II #2022399. Published by Robert Wallace, II (A0.881522). Sonata for 2 Guitars is composed in 3 movements of typical sonata form. Technical challenges are contained within both parts, and the piece is great for study and concert.