Sacred Music has become available on line thanks to The Chant Cafe. In it there is an extended article by Susan Treacy (pp. 27ff) on the American composer Kevin Allen (see link at the right of this page). The article includes a listing of Allen's compositions to date (pp. 35ff) and scores for the Sanctus of his Missa Deus Sempiterne and a setting of the Tantum Ergo.