Purchase a copy of "The Songwriter's Market." It is the definitive compendium of musician needs, including current and updated directories for nearly every music talent management agency in the country.
Search the book based on style or performance genre. While some music agencies will accept any act in any style, the most successful target specific niches within the music market. These are the best for up-and-coming artists, as they offer the largest opportunity to be discovered.
Contact the agencies by following the explicit step-by-step instructions outlined in their listings. If you do not follow their instructions, they simply will not listen to or watch your submissions.
Search the Internet for local music talent management agencies in your general area. If you live in a rural area, search the nearest metro. Local agencies often will go the extra mile to help local talent hit the big time in the music industry.
Read the inside liner notes of your favorite artists and see who their managers and agents are. They probably will even include addresses where you can submit a letter of inquiry or a letter requesting permission to send a demo.