The Singing String Quartet ‘Well-Strung’ will be performing at Rockwell in Los Feliz. The all-male string quartet ‘Well-Strung’ features classical musicians who sing putting their own spin on the music of Mozart, Vivaldi, Rihanna, Adele, Lady Gaga, Pink, Kelly Clarkson, as well as new material written by Jeffrey Roberson. The one-night-only show is set for Tuesday, Apr. 1 at 8 p.m. Tickets, $30, available online.