I am involved in organizing a musical event to raise money for a local homeless charity.  The concert will include choirs from 15-20 area churches (a few hundred singers) and orchestra.  One of the mass choir numbers we will be doing in October is Ralph Vaughan Williams' "O Clap Your Hands."   This piece was published in 1920, and I have official confirmation from the publisher that it is in the public domain in the United States.  I have a score for choral parts, but I need the instrumental parts.  If there is anyone out there who has that music and would be willing to copy and share with me, I would greatly appreciate it.  Thanks!    --Bruce