From the Royal Albert Hall, London. Sarah Walker presents the conclusion of Piano Day at the Proms, with two classics of the 20th century multiple-piano repertoire: Bartok's vibrant Sonata, and - continuing the survey of Stravinsky ballets at the 2009 Proms - his visceral portrayal of Russian peasant wedding celebrations. Tatiana Monogarova (soprano) Elena Manistina (mezzo-soprano) Vsevolod Grivnov (tenor) Kostas Smoriginas (bass) John Constable, Alissa Firsova, Rolf Hind, Tom Poster, Ashley Wass, Llyr Williams (pianos) Philip Moore, Simon Crawford-Phillips (pianos) Colin Currie, Sam Walton (percussion) BBC Singers Synergy Vocals London Sinfonietta Edward Gardner (conductor) Bartok: Sonata for two pianos and percussion Stravinsky: Les noces (sung in Russian).