Adagio for Strings, Op. 11a

Concerto for Strings No.1 op.46 - 3. Adagio

This is even more confusing - Milestone Session Op.9 No. 10

Beethoven Piano Sonata No. 8 in C minor, Opus 13, II. Adagio (as made famous by Ludwig van Beethoven)

Valleys And Mountains Suite, Op. 64: III Mount Solitary Adagio-Allegro Bruce Cale.