*DJs (disc jockeys) play recorded music for audiences on radio or at live venues. There are three main types of DJ: Club DJs: * work in clubs and bars, often supporting the work of a MC (master of ceremonies), who might rap or sing over the music * play and mix records to encourage people to dance, or to keep an atmosphere, either in one style or a mixture of styles * use additional equipment such as drum machines, synthesizers and sound *Professional Singers or Vocalists perform live in front of an audience or make recordings for broadcast, CD or download. They interpret music by using their knowledge of voice production, melody, harmony, and rhythm. processors to produce their own unique sounds. (music job descriptive)

 The role of a Brand Manager or Product Manager working in the music industry is to help create and implement marketing campaigns to maximize the sales of music from a particular record label, artist, online music service, radio station or other music product. They will usually be employed by a large or well established record label or music company and are likely to be responsible for managing the campaigns for a specific artist, product or group of artists.

 Recording industry Producers organize all aspects of recording music. Many operate in the traditional way of working with performers in a recording studio with the assistance of a sound engineer. Others use their own equipment to try out ideas but use a commercial recording studio for the final recording. With changes in technology an increasing number of people are becoming involved in producing their own music. Wikipedia is where I got all of my information.

 Yes they do need to work together because working in the music industry is to help create and implement marketing campaigns to maximize the sales of music from a particular record label, artist, online music service, radio station or other music product.