 79, even though it is actually Taneyev's personal arrangement of what is otherwise Tchaikovsky's unscored draft.Arguments concern whether it was worth Taneyev's efforts to resurrect this material—when Tchaikovsky had already expressed doubts as to its musical quality—and whether the "Andante and Finale" should be performed alongside Tchaikovsky's completed movement.Most pianists performing the third concerto have only played the single-movement Op.