The Fitzwilliam String Quartet play on instruments with historical setups. So, don’t expect lashings of vibrato; instead, open your ears to playing of miraculous focus recorded with breathtaking realism, which often feels like sitting among the players. Schubert’s last quartet, the magnificent String Quartet No. 15 in G Major, receives a performance that perfectly gauges not only the work’s power and intensity, but also its deep humanity. Lyricism is paramount here and the Fitzwilliams make this score sing beautifully. Composed six years earlier, String Quartet No. 12 in C Minor—febrile and hinting at the great chamber music still to come—is also superbly played.