Rhode Island’s Collegium Ancora made their debut back in November. Now the chamber choir is back with A Little Night Music, an evening of songs that all thematically tie back to nighttime. The program includes Vaughn Williams’ 16-part Shakespearean rhapsody, as well as work from Brahms, Barber, Lauridsen, Stanford, and even Sondheim. (Will it be “Send In the Clowns”? It has to be “Send In the Clowns”, right?)