Cubus plays Op. 55, No. 5 in F major by Ludvig Schytte. It is from a set of 6 pieces named Lyriske Smaastykker (small lyrical pieces).
A link to an mp3 and sheet music of this piece can be found at
Playlist with all musical pieces by SCHYTTE posted by cubusdk:
Sound: EastWest Quantum Leap Pianos - Steinway D (a sampled 9-foot American Concert Grand).