If it sounds like a heavenly host is singing “Alleluia!” when I say something brilliant on Autoline After Hours’ annual Presents & Coal webcast Thursday, you won’t be wrong.

For the first time, the program will have live backing vocals provided by members of the Motor City Chorale, formerly the General Motors Chorus.

The group’s roots date to 1933, in the days when big companies sponsored lots of after-hours employee activities – bowling leagues, softball, etc. Choral groups were very popular at the time, and GM’s was one of the biggest and best, with a peak of 450 members. GM provided robes – of course there were robes – sheet music, transportation and the like.

GM stopped sponsoring after work activities to save money in the recession of 1978. Its chorus still had 130 members. They changed the name to GM Employees Chorus and paid their own way, morphing again into the current group in 2014, said member Sue Frost, who’s a retired GM lean manufacturing engineer.

The chorale performs about 25 shows a year, singing everything from religious music to show tunes and popular music. Most of the current 54 members have a connection with GM.

The Motor city Chorale (www.motorcitychorale.org)  will perform holiday music twice Sunday, Dec. 13: 3 p.m. at Grace Lutheran church in Romeo and 7:30 at St. Thomas Lutheran church in Sterling Heights.

About 16 members will perform four songs during the webcast, which goes live at 3 p.m. Thursday and can be viewed whenever you’re online after that at www.autoline.tv

I’ll be showering praise and criticism on automakers during the “Presents & Coal webcast, along with Autoline hosts John McElroy, Gary Vasilash of Automotive Design & Production and Scott Burgess of Yahoo Autos.

Join us. It should be fun.

Contact Mark Phelan: mmphelan@freepress.com or 313-222-6731. Follow him on Twitter @mark_phelan.