Beaterator is a rhythm game developed and published by Rockstar. It will be released on 29 September 2009 in North America and 2 October 2009 in Europe.
Originally created in 2005 as a Flash application on the website of Rockstar, Beaterator offers thousands of songs and sounds created by Timbaland and Rockstar.
Beaterator is presented as being able to let someone make music professional level easily.
Here is the video: