Concerto for Clarinet and Viola, op. 88: I. Andante con moto

The Concerto for Two Pianos and Orchestra, Op. 88a, was written by Max Bruch in 1912. It is in four movements, written in the rarely seen key of A♭ minor, and takes about 25 minutes to perform.
It is sometimes referred to as Bruch's Double Concerto, although this could also refer to his Concerto for Clarinet, Viola, and Orchestra, Op. 88 (1911). There are claims that the two-piano concerto is based on the earlier concerto, but thematically these two works seem to have little or nothing in common, and this supposed relationship seems to be an erroneous assumption based purely on the works having similar opus numbers.