A pint with your Poulenc? Sipping with your singing? Classical music: It's not just for concert halls anymore.
This one site that is on this topic:
http://welltempered.wordpress.com/2012/02/13/classical-music-news-lets-go-to-the-bar-have-a-drink-and-hear-some-classical-music-classical-revolution-madison-announces-its-spring-season-of-performances/
A few years ago there was a group called Liederwolf here in Montreal who performed art song recitals in bars and cafés. And of course, there's nowhere more casual than my living room. That's where I perform music!