Set Down Servant by Robert Shaw

This is a song that BHCS Concert Choir is taking to festival (LGPE). One of the more awkward parts of the song is at the beginning. I call it the "chu-chu-du" section. The "chu-chu-du" is repeated with claps in between each one. It sounds on the breath. Notice the crescendo from beginning until the starting of the chorus. Listen to the recording on this link for a decent example. Also, soloist will probably be an alto and a bass