Key Poulan is the brass composer/arranger for the Santa Clara Vanguard. Key also serves as the composer/arranger for the Spartans, Renegades, and New York Skyliners Drum and Bugle Corps. As the owner of Key Poulan Music, he has been recognized as one of the country's top arrangers and composers in the area of contemporary marching band and has several concert band works to his credit. His marching band arrangements have won several national titles at the Bands of America Grand Nationals Championships.

His works have won many state titles throughout the United States, and has been performed in Canada and Japan. His transcription of "The Promise of Living from Copland's Tender Land" was extremely well received at the Bands of America National Concert Band Festival and his original works "Carnegie Fanfare and Dance" and "Fortune in Steel" were both premiered in New York City's Carnegie Hall.