This work has been performed several time by Mr. Barrett and once by the composer, also at Church of the Good Sheppard in NYC. The work was also performed by the composer in 1969 at the 1st Presbyterian Church in Billings, Montana. The work is based on motives derived from a computer analysis of a slection of the Mode V chants of the Liber Usualis. This analysis was designed by the composer and published in the Yale Journal of Music Theory.