Frederic Rzewski Late Piano Works Bobby Mitchell, piano Naxos   Frederic Rzewski (1938-2021) was a gifted composer and pianist. His oeuvre included pieces in many genres, but it is his piano works that, to date, are best known. Rzewski premiered a number of pieces, but in his later years deputized pianist Bobby Mitchell, dedicating works to him and trusting his talent to be sufficient for their often virtuosic and complex interpretive demands.   Rzewski’s pieces combine modernism and vernacular styles, particularly leftist folk songs, often in sets of multifaceted variations. War Songs (2008) includes songs that are both pro and