A box grouping the ballets of Piotr Tchaikovsky may not be particularly original, but this Decca reissue of Swan Lake, The Sleeping Beauty and The Nutcracker performed by the Mariinsky Theatre Orchestra under Valery Gergiev nonetheless requires extra attention. The new liner notes by Julian Haylock coming with the set fail to remind us that these ballets were either created for St. Peterburg's Mariinsky or made famous by that theatre and to this day never left its repertory.