Piano,Viola - Level 5 - Digital Download SKU: A0.1004688 Composed by Adrian Gagiu. 20th Century,Contemporary. Score and part. 67 pages. Adrian Gagiu #4298105. Published by Adrian Gagiu (A0.1004688). Piano reduction of the Viola Concerto in D minor, op. 18a, which in turn is an adaptation of the Violin Concerto, op. 18, a Neo-classical composition influenced by Romanian traditional music, Bartok and Stravinsky.