|Release date(s)||1 March 2013|
|Genre(s)||Music video game|
Synthesia is a video game and piano keyboard trainer for Microsoft Windows and Mac OS X, which allows users to play a MIDI keyboard or use a computer keyboard in time to a MIDI file by following on-screen directions, much in the style of Keyboard Mania or Guitar Hero. Additionally, Synthesia can be paired with MIDI keyboards that have illuminated keys, which some people believe makes learning piano easier for beginners. It was originally named Piano Hero, due to the similarity of gameplay with Guitar Hero; until Activision (the owners of the rights to Guitar Hero) sent a cease and desist to the program's creator, Nicholas Piegdon.
Synthesia was originally an open source project, but seeing the potential commercial value of the program, Piegdon decided to stop releasing the source code (version 0.6.2), however leaving the most recent open-source release available for download. While the basic functionality is still currently[when?] free, a "Learning Pack" key can be purchased to unlock additional features, such as a sheet music display mode.
Synthesia has support for playing custom MIDI files, as well as linking with MIDI devices. Synthesia will rate your performance afterwards, and give you a score which you can submit to an online scoreboard. Synthesia also has a paid "Learning Pack" that allows the user to view music in Musical notation, as well as multiple practice features, such as "Melody Practice" which pauses the song whenever the user misses a note, and only continues when the right note is played. 
Cease and desist letter
In a letter dated 26 March 2007, Activision requested that Piegdon "immediately cease any and all use of the "Piano Hero" name in connection with the distribution and promotion of [his] video game and agree not to use such in the future". Piegdon responded by hosting a contest for a new name for the project, resulting in the name, Synthesia, suggested by Daniel Lawrence.
- "Activision sends Piano Hero fella cease and decist; denies plans of Lawyer Hero". Destructoid. Retrieved 2008-01-10.
- "'Piano Hero' Name Cease And Desist From Activision". Synthesia Official Website. Retrieved 2012-01-04.
- "You want Piano Hero on your Mac?". TUAW. Retrieved 2008-01-10.
- "Synthesia Features". Synthesia Official Website. Retrieved 2012-03-10.
- "Piano Hero Gets Cease and Desist". Kotaku. Retrieved 2008-01-10.
- "Synthesia Name Change". Synthesia Official Website. Archived from the original on 2007-10-24. Retrieved 2014-08-18.