The piano used on these videos is the Korg Pa588.  With its mix of digital piano and automatic accompaniment features, it is one of the most powerful musical instruments available today. Its features includes,

• high quality realistic piano keyboard, and damper pedal with realistic simulation of natural string resonances of an acoustic  piano 
• powerful sound generation system, 80 voices of polyphony, multitasking operating system to let you load data while playing your instrument, and memory card drive to store your data
• 882 factory sounds,   56 factory drum kits, 128 user sound, and 64 user drum kits
• 256 performance locations and 1,280 pre-loaded single touch settings for fast settings of keyboard sound ad effects.  Single touch settings allow you to instantly change the sounds assigned to each of the keyboard tracks with a single button press, allowing for wide variation in sounds during a performance.
• More than 320 preloaded styles
• Style record and edit and pad record and edit.  For each style, there are four variations which can be programed.  Each style allows you to embellish your performance with a set of musical introductions and endings. 
• Full featured 16 track sequencer
• Fully editable music database for fast song retrieving
• Touch-view graphical user interface
• Fully programmable slider and pedal  
• In addition to the style and pad tracks, up to four additional parts can be played on the keyboard in real time.