A chorus is all about sound, and the KC Women's Chorus chimes in with the best of 'em. But the second thing an audience notices, after the members' voices, is their faces. This robed bunch is one of the most diverse performance groups in the city. The members are single, married, gay and straight — leaving gender the main thing that they all have in common. Since Joseph P. Nadeau, artistic director, came aboard for the 2009-10 season, the chorus has doubled in size. Last February, it joined with the Heartland Men's Chorus to perform Gabriel Fauré's Requiem and used the proceeds to buy a new organ for Redemptorist Catholic Church. As if they couldn't already sing their way into heaven.