Their second duo album on Signum Classics, Viktoria Mullova and Alasdair Beatson perform Beethoven’s Sonatas 6, 1, and 8. Just as in previous recordings, they use a copy of an 1805 Walter (a Viennese fortepiano) by Paul McNulty; together with violin strung with gut, these instruments are what Beethoven’s music craves, giving a rich texture and distinct colors between the registers.