Yes, Le Scaramouche, it's from the Sir Walter Scott story. I don't even know what the words mean, I've been told that each person in the sextet sings there innermost thoughts at the wedding scene. But the music is unbelievable, very positive and affirming (and it's got a perfect beat for a slow jogger.) James Michener even wrote about the interplay of words, and the artistic effect of ensemble singing.

Many people know this opera for the "crazy" scene in which the soprano imitates a flute (or vice versa). Dame Joan Sutherland made this famous. Unfortunately, this has been the target of caricatures, and has turned people off from the lovely music, and from opera in general.