Dmitri Shostakovich’s long-lost Impromptu for Viola and Piano, Op. 33, recently unearthed in the Moscow State Archives, receives its world-premiere recording on Matthew Lipman’s Ascent, the acclaimed young American violist’s solo debut album, featuring, in the artist’s words, “music enraptured by flights of fantasy.” Recipient of a 2015 Avery Fisher Career Grant, Lipman has created an album of uplifting and spiritually transcendent works for viola and piano, dedicated to his late mother. In this wide-ranging program, his collaborator is pianist Henry Kramer, winner of the Second Prize at the 2016 Queen Elisabeth competition.