Edward Clug's "Guilty" (to a Chopin Nocturne) amounted to an innocuous, improvisationlike foray for Mr. Matvienko, clad in a black shirt and pants.

WSJ: Kings of the Dance, Opus 3 | Royalty Made Common | By Robert Greskovic

She switched to a Chopin Nocturne.

WSJ: Digital Pianos: Great Performers for Tight Spaces