A musical ensemble, also known as a music group, is a group of people who perform instrumental or vocal music, typically known by a distinct name. In classical music, trios or quartets either blend the sounds of musical instrument families (such as piano, strings, and wind instruments) or group together instruments from the same instrument family, such as string ensembles or wind ensembles. In jazz ensembles, the instruments typically include wind instruments (one or more saxophones, trumpets, etc.), one or two chordal "comping" instruments (electric guitar, piano, or organ), a bass instrument (bass guitar or double bass), and a drummer or percussionist. In rock ensembles, usually called rock bands, there are usually guitars and keyboards (piano, electric piano, Hammond organ, synthesizer, etc.) and a rhythm section made up of a bass guitar and drum kit.

Classical chamber music

In Western classical music, smaller ensembles are called chamber music ensembles. The terms duet, trio, quartet, quintet, sextet, septet, octet, nonet and dectet describe groups of two up to ten musicians, respectively. A group of eleven musicians, such as found in The Carnival of the Animals, is called either a hendectet or an undectet (see Latin numerical prefixes). A solo is not an ensemble because it only contains one musician.

Rock Band is a music video game developed by Harmonix, published by MTV Games and Electronic Arts. It is the first title in the Rock Band series. The Xbox 360 and PlayStation 3 versions were released in the North America on November 20, 2007, while the PlayStation 2 version was released on December 18, 2007 with the Wii version being released on June 22, 2008. The Xbox 360 version was released in Europe on May 23, 2008 while the PlayStation 3, PlayStation 2, and Wii versions were released on September 12, 2008. All four ports of the game were released in Australia on November 7, 2008. The game was to be released in Japan and to be developed by Q Entertainment but it was canceled.

Rock Band allows up to four players to simulate the performance of popular rock music songs by playing with controllers modeled after musical instruments. Players can play the lead guitar, bass guitar, and drums parts to songs with "instrument controllers", as well as sing through a USB microphone. Players are scored on their ability to match scrolling musical "notes" while playing instruments, or by their ability to match the singer's pitch on vocals. Players with the Xbox 360 and PlayStation 3 versions can interact with players on the same platform through both online and offline multiplayer capabilities. In addition to the 58 core songs included on the game disc, over 2,000 downloadable songs were released for the Xbox 360 and PlayStation 3 versions.

Rock Band 3 is a 2010 music video game developed by Harmonix. The game was initially published and distributed by MTV Games and Electronic Arts, respectively, in late October 2010. Mad Catz took over both roles and re-released the title on November 23, 2011. It is the third main game in the Rock Band series. As with the previous titles, Rock Band 3 allows players to simulate the playing of rock music and many other subgenres using special instrument controllers mimicking lead and bass guitar, drums, and vocals. Rock Band 3 expands upon previous games by including three-part vocal harmonies — previously used in The Beatles: Rock Band and Green Day: Rock Band (up to 3 singers on a song) — plus support for MIDI-compatible keyboards, electronic drumkits, and even use of a real guitar in "Pro" mode.

Distinguishing it from all previous rhythm music games, Rock Band 3 features "Pro" mode, which is designed to accurately mimic playing of real instruments. In Pro mode, real guitar and bass players have to match specific fingering on frets and strings, drummers have to strike cymbal pads in addition to snare and toms, and keyboardists have to use precise fingering across the whole keyboard. MadCatz manufactured a 102-button controller with 6 strings meant for bass and for lead guitar Fender lent a real Fender Squier stringed guitar modified with built-in electronics and enhancements to support Pro mode. Real instruments and original Basic controllers can be played simultaneously in various combinations within the game to simulate playing in a real band. Before a song starts, the players choose which instrument they will represent within the song. If the right note is hit or played, it is heard in the audio. If notes are missed, they are not heard.