Composers are almost always happiest when they know for whom they are writing, and when they can tailor their latest work to a specific musician’s talents, especially in the realm of vocal music, where the subtle discrepancies between voices of can make a world of difference in performance. In an effort to promote such collaborations, a new workshop has been launched by the composer John Harbison and the soprano Dawn Upshaw, bringing together young singers and composers who have never met, but who will be expected to make music together by the end of the session.