Can someone please help me with a marketing letter to promote my music cd to record labels and to radio ?

Im trying to promote my gospel cd to radio and to record labels that accept CD's but I need to know how to send a cover letter to them to get my work recognize is there any sample cover letters online that can show me how to write a good cover letter to record label and radio station so i can submit my cd to the ones of them that accept the cds??? please help