The musical pieces presented on this webpage are played on digital pianos. So far three digital pianos and several software pianos have been used in the videos.
From the very first movie on July 01, 2007:
Felix MENDELSSOHN: Op. 30, No. 6, [v01]
until the movie on April 23, 2008:
Franz SCHUBERT: Op. 91, No. 1, D924 (12 Graz Waltzes)
a Casio CDP-100 digital piano has been used. Reverb from a Soundblaster Live computer soundcard has been added to the piano sound.
Casio CDP-100
From the movie on April 29, 2008:
Franz SCHUBERT: Op. 91, No. 3, D924 (12 Graz Waltzes)
until the movie on June 20, 2009:
THE BEATLES: Nowhere Man (jazz-style piano)
a Yamaha P-140 digital piano has been used. Reverb from a Soundblaster Live computer soundcard has been added to the piano sound.
Yamaha P-140
From the movie on July 02, 2009:
Johannes BRAHMS: Op. 39, No. 3 (Waltz) [v02]
until recent videos a Roland RD-700GX digital piano has been used.
Roland RD-700GX
From the movie on March 12, 2010:
Johann Sebastian BACH: March in D major, BWV Anh. 122
the Roland RD-700GX keyboard was upgraded with the K-RD700GX1 SuperNATURAL Piano Kit.
K-RD700GX1
The upgrade kit consists of an expansion board with a new sound engine and a USB stick with a new operating system for the keyboard.
The kit deals with the main problem with digital keyboards: the more or less sudden changes in sound at certain velocities because of the use of for instance 3 patches for each piano tone.
Roland names this new important technology with seamless transitions from low to high velocity (ppp to fff) SuperNATURAL Piano sound engine. Casio names it Linear Morphing System and Yamaha names it Spectral Component Modeling.
From the movie on January 05, 2010:
Erik SATIE: Nocturne No. 2 [v01b]
until recent videos the piano sound might come from a virtual piano (computer software piano).
Playlists organized by keyboard/software ...
Other articles ...
Musical Pieces 
