It’s often said that what matters is the singer, not the song, which is why music fans are still moved by Bing Crosby’s rendition of “99 Bottles of Beer.” Savor voices that could sing the phone book with today’s GrouponLive deal: for $20, you get two tickets to Chorus Austin’s performance at Saint Matthew’s Episcopal Church on Sunday, October 16, at 3 p.m. (up to a $40 value). All seating is general admission, so arrive early to get the best seats.

After radiating do-re-mis through Carnegie Hall and China’s 2010 World Expo, the Austin Civic Chorus of Chorus Austin embarks upon its 47th year of harmonious belting, energized by a placing among 10 finalists nationwide for the prestigious American Prize in 2011. To kick off the new season, the choir sings the poignant notes of Rossini’s “Petite Messe Solennelle,” an 1863 composition that the composer dubbed, “the last of my sins of old age” in reference to his penchant for plagiarizing songbirds. As music director Ryan Heller conducts the tapestry of 130 voices with an experienced ear, two pianos and a harmonium hum along to the beat. Four soloists stand to flex their professional pipes and singing biceps, including soprano Mele Dailey, mezzo Kathryn Findlen, tenor Nicholas Simpson, and bass Bruce Cain.

Though the chorus offers students and seniors discounted tickets for $15, this deal still offers the best deal available.