Sater has been working on a new musical with Burt Bacharach, entitled "Some Lovers", based on the short story The Gift of the Magi by O. Henry. It is Bacharach's first new score for the theater since "Promises, Promises" in 1968. The musical had its regional premiere at The Old Globe in November 2011, a concert at Lincoln Center in 2016, a production at The Other Palace in London in 2017, and a subsequent production in 2018 at the Adirondack Theatre Festival. British vocalist Rumer recorded “Some Lovers” as a single from the show as a part of her album "Sings Bacharach at Christmas", which also featured Bacharach's “Alfie”. Dionne Warwick also recorded a single from the show, “This Christmas”.