The 55-member ensemble touts itself as "the premiere chamber choir in Central Arkansas" and we doubt it gets much guff about that title. Since 1979, the Arkansas Chamber Singers have been the go-to choral group for everything from memorials to inaugurations and everything between. But the yearly Christmas concerts hold a special place in Little Rock's holiday soundscape. This year, members of the Arkansas Symphony Orchestra join the Arkansas Chamber Singers as they close out their concert season with "Bach to Christmas," an evening of excerpts from "Christmas Oratorio" and, notably, "Uns ist ein Kind geboren," a cantata originally attributed to Bach, but recently suggested to have been written by Bach contemporary Johann Kuhnau. Since the piece's authorship has been under suspicion, it has fallen out of favor with a number of choral groups as of late, making this presentation a rare treat. The Arkansas Chamber Singers perform the program again at 3 p.m. Sunday, Dec. 12, in the Pulaski Heights Methodist Church. For tickets, call 377-1121 or visit ar-chambersingers.org.