Establish a presence in the music industry by performing live, releasing music and networking with bands, producers and journalists. In order to gain the interest of a lawyer, manager or other professional who can get your music to Warner Brothers, you'll need to show you have a marketable product.
Contact a lawyer, publisher and/or attorney with a background in music business and establish a professional relationship. Negotiate a contract. For example, a lawyer might do the legwork for you in return for a percentage of an advance that Warner Brothers might give you.
Prepare a press kit that includes a biography, press clippings, demo CD and other pertinent information relating to your music.
Request that your representation submit your press kit to Warner Brothers and arrange a meeting to present your music to an artists and repertoire (A&R) executive there.