One of the indisputable best parts of every Christmas is the music. We may not get the gift we want, snow or even an apology during the annual airing of grievances, but there will always be music. One of our longstanding cultural treasures is the Bach Society of Saint Louis, which has delivered music for Christmas for more than 75 years. The group's Christmas Candlelight Concert combines a beautiful performance space, the soft glow of candles and two full choruses singing popular and classical Christmas songs. This year's concert stars Handel's glorious Messiah, with the St. Louis Children's Choirs raising their voices with the Bach Society. The show starts at 7:30 p.m. Tuesday, December 19, at Powell Hall (718 North Grand Boulevard; www.bachsociety.org). Tickets are $30 to $75.