Intercalations was written in 1986 for Margaret Mills, who gave its premiere in 1986. Each of the four pieces bears a subtitle and can be related to a traditional keyboard model. The first, Interspace , alternates passages of imitative counterpoint with ecurstions that often involve figuration or ornamentation rather in the manner of a preludial ricercare. Interplay is toccata-like, with steady rapid motion that features repeated notes. Interlacing is a song without words: meditative, lyrical, improvisatory and moody. The last, Interaction , the most orchestral fo the four, is a narrative perhaps akin to the ballade or tone poem.