South Carolina Educational Television
Etv: Artopia: Meet an Artist: Musicians
Find a series of videos of artists working as musicians, music directors, music educators, and songwriters in which they explain their artistic thinking and techniques and what it is like to be working in the music field.
Other
The American Federation of Musicians
The American Federation of Musicians is the union for musicians in America. Although work can be found without union membership (which is less true for actors), there is good information here.