Cubus plays Op. 28, No. 20 by Frédéric Chopin.
Playlist with all musical pieces by CHOPIN posted by cubusdk: https://www.youtube.com/playlist?list=PLE0A723E0DE7FC233
A link to sheet music can be found at http://cubus-adsl.dk/
The chord progression in the piece was in 1973 used as a basis for a pop song by Barry Manilow: “Could It Be Magic”. This song is also covered by Donna Summer (1976) and Take That (1992). Furthermore the chord progression appears in Visions Prelude by Angra (2001).




