Thanks for starting this thread. A travesty, for sure, that it didn't exist before! A few favorite Weill performances: Ute Lemper in The Seven Deadly Sins, with Peter Oundjian and the Toronto Symphony Orchestra (2008), and just last year, the Violin Concerto with the Minnesota Orchestra, Osmo Vänskä, and concertmaster Erin Keefe in the solo role. The concerto has an unusual instrumentation: winds, trumpet, two horns, percussion, timpani, and four double basses -- the latter are the only strings, aside from the soloist.
Lemper has done a lot of Weill over the years, and is one of his most ardent interpreters. Her smoky voice is ideal for songs like "Mack the Knife" and "Speak Low." (There's a ton of stuff on YouTube.)
--Bruce