Perhaps the younger audience and the popularity of the event had more to do with the price (free!) and the fact that the orchestra had left the symphony hall. Mother Jones floated that hypothesis in a November 2014 article with the dramatic title “Can Concerts in Bars and Cafés Save Classical Music?” It profiles Classical Revolution, an organization with chapters in 30 cities around the world that play chamber music in nontraditional settings. There’s a Baltimore chapter of the organization, which is starting a monthly residency at Joe Squared in Station North called “Drunk Bach.” Its first show is this Saturday, Jan. 24, at 8 p.m., with a performance from Mobtown Stringband afterward; the shows will continue on the fourth Saturday of every month. And if you want to check out the opera in a setting that’s significantly more casual than the Lyric Opera House, Peabody Conservatory’s Early Music Department is presenting two “short but decadent” operas, “La descente d’Orphee aux enfers” and “Le mariage force,” at the Theatre Project on Tuesday, Jan. 27, and Wednesday, Jan. 28. Tickets are $20, but students who show their ID at the door get in for free.