Boundless: that's how one might describe these sonatas by Prokofiev, Weinberg, Bernstein and Poulenc. All of them, except the one by Poulenc, were composed during the Second World War, a fact that is worth noting, given their great virtuosity, each one exploring in a different way the boundaries of the genre. While Weinberg draws on klezmer, the music of his childhood, and Bernstein on jazz, Prokofiev, like Poulenc, chooses a classical language, treated with great freedom. Prokofiev's famous Flute Sonata in D, which appealed so immediately to the violinist David Oistrakh, is presented here in a new transcription for clarinet. Pablo Barragán and Sophie Pacini form a duo that is dynamic and refined and they are perfectly at home in this repertoire.