Yannick Nézet-Séguin performs both as conductor and pianist with The MET Orchestra Chamber Ensemble. The program opens with Metamorphosen, a brilliant creation by an older R. Strauss. Interpretations of its title and thematic content arouse great debate—is it an abstract, purely musical study as its title suggests, or shall we read autobiographical clues?—but what remains certain is its absolute transportive power upon listeners. Brahms’s Piano Quintet is widely regarded as a chamber music masterpiece, with each of its four significant movements serving as a whole with remarkable depth.