Although it is not described as one of the four core elements that make up hip hop, music producing is another important element. In music, record producers play a similar role in sound recording that film directors play in making a movie. The record producer recruits and selects artists (rappers, MCs, DJs, beatboxers, and so on), plans the vision for the recording session, coaches the performers on their songs, chooses audio engineers, sets out a budget for hiring the artists and technical experts, and oversees the entire project. The exact roles of a producer depend on each individual, but some producers work with DJs and drum machine programmers to create beats, coach the DJs in the selection of sampled basslines, riffs and catch phrases, give advice to rappers, vocalists, MCs and other artists, give suggestions to performers on how to improve their flow and develop a unique personal style. Some producers work closely with the audio engineer to provide ideas on mixing, effects units (e.g., Autotuned vocal effects such as those popularized by T-Pain), micing of artists, and so on. The producer may independently develop the "concept" or vision for a project or album, or develop the vision in collaboration with the artists and performers.