Expect to see William Bolcom in the news come November when his Lyric Opera-commissioned McTeague premieres. In the meantime, however, the talented composer and pianist is still better known for the act he and his wife, mezzo-soprano Joan Morris, have performed for years. When it comes to singing popular American tunesfrom Foster to Bernstein--the Morris-Bolcom partnership really brings on the nostalgia. (Only Marilyn Home can be more stirring.) Morris's singing can be ardent and sweet and Bolcom's accompaniment is always assured and elegant in performances that serve up both wicked insouciance and down-home appeal. For this recital the pair promises the usual rich mix of cabaret numbers and folk songs. Works by Porter and Gershwin will likely be included, but some of Bolcom's own songs may be presented as well. Monday, 8 PM, Murray Theatre, Ravinia Festival, Green Bay and Lake Cook Rds., Highland Park; 728-4642.