Viola Duet Viola - Level 2 - Digital Download SKU: A0.1250836 Composed by Christine Donkin. Contemporary. Score. 2 pages. Chrisitne Donkin #845105. Published by Chrisitne Donkin (A0.1250836). One line of music played forwards and backwards simultaneously. The canon is notated two ways: on the first page it's shown as a single line of music in the alto clef; on the second page it's notated on the grand staff as a two-part piece, in order to be read by the player of a keyboard instrument.