"DrumMania ((alternately drummania, abbreviated DM) is a music video game series produced by Konami Digital Entertainment, Inc., where colored notes travel down the screen which correspond with color coded parts of an electronic drum set. The player must hit the drum parts when the notes reach the bottom of the screen in order to fill in missing drum parts from a song.
Earlier versions of DrumMania, which includes those released before DrumMania 10th Mix, have been released in Asian countries under the title Percussion Freaks.
Since DrumMania V, DrumMania and GuitarFreaks had been united with a single version number as part of the 5th Anniversary of the video game. DrumMania V6 is the latest version of the DrumMania series, and it links to GuitarFreaks V6.
Konami has not mass produced an American version of DrumMania, primarily since John Devecka holds the US patent for "drum simulation games", which Activision had purchased and utilized in Guitar Hero series. Even with this possible obstacle in mind, Konami has tested English builds of DrumMania and Guitar Freaks V4 at the ATEI exhibition in London and at a Brunswick Zone bowling alley in Naperville, Illinois - though official releases have not been announced. Nonetheless, imported versions of DrumMania can be found in various locations across the United States and Canada."
Source: Wikipedia, "DrumMania", available under the CC-BY-SA License.