Role of the record company

In Drake's 'Started from the bottom' their are three record companies which were involved in Drake's single, Young money, Cash money and Republic.
The role of these record companies is to market the music in which their artist produces, the singer is reliant upon these to broaden their consumers. 

Also the record company is responsible for marketing the product by selling it to the public and also getting the song and artist promoted and getting the song heard on all the mainstream radio's playing throughout the day but mainly at a time where most of the audience will be listening.