A concert band is a performing ensemble consisting of members of the woodwind, brass, and percussion families of instruments, along with the double bass.
A concert band’s repertoire includes original wind compositions, transcriptions/arrangements of orchestral compositions, light music, and popular tunes. Though the instrumentation is similar, a concert band primary function is as a concert ensemble.
A disc jockey (abbreviated DJ, D.J. or deejay) is a person who plays recorded music for an audience, either a radio audience if the mix is broadcast or the audience in a venue such as a bar or nightclub. In venues such as a club event or rave, this is an audience of dancers.
The title “DJ” is also commonly used by DJs in front of their real names or adopted pseudonyms as a title to denote their profession and the music they play.
A DJ mixer is a type of audio mixing console used by disc jockeys (DJs). DJs playing music for dancers at a club use the mixer to make smooth transitions between different songs which are played on sound sources that are plugged into the mixer. These sound sources could be turntables, CD players, or iPods. A “scratching” DJ uses the mixer in combination with turntables or specialized DJ CD players to create unique sound effects. The DJ mixer also allows the DJ to use headphones to cue the next song before playing it. Most DJ mixers can only accommodate two turntables or CD players but some mixers (such as the ones used in nightclubs) Can accommodate up to four turntables or CD players.
The key features that differentiate a DJ mixer from other types of audio mixers are the ability to redirect (cue) a non-playing source to headphones, in order to find the desired part of a song and the presence of a crossfader, which allows for an easier transition between two sources. DJ mixers are also used to create DJ mixes, which are recorded and sold.