My favorite performance of that 4th impromptu is actually an old Philips recording by Bela Davidovich. Very expressive, well recorded, and quite a bit better than the Rubenstein performance I have.
newbee - I just want to disagree with your recommendation of Biret on Naxos. I have her recording of the sonatas and, due to poor sonics, it is a mush - distant and muddy.
newbee - I just want to disagree with your recommendation of Biret on Naxos. I have her recording of the sonatas and, due to poor sonics, it is a mush - distant and muddy.