Here is the answer to your graduation march woes! Including two separate, complete marches in one publication, with each march preceded by a short fanfare, James Ployhar has created an exceptionally functional, quite easy-to-play work that can't be beat. The processional march is Sir Edward Elgar's Pomp and Circumstance and the recessional march is a very appropriate original work.
Sir Edward Elgar/arr. James Ployhar - Alfred Publishing Co., Inc.