Er...no. That's nothing like it. It's a classical/choral piece.
I don't recall hearing this one in the episode, but it's possible that it is featured, but at another point, I guess. But, no, it's definitely not the piece I'm looking for.
LabRat
Athos: If you'd told us what you were doing, we might have been able to plan this properly. Aramis: Yes, sorry. Athos: No, no, by all means, let's keep things suicidal.
It's a classical/choral piece. 
