I've been trying to recall the title-described movie for days now, and I can't quite place it. It's action/thriller, as I recall, I think with either some mistaken-identity regarding the main character, or a situation where the bad guy(s) framed him. Either way, I'm pretty sure he and his reluctant partner had to work against the system to save the day.
The bomb was either under the conductor's podium, inside an organ console, or under the piano, can't remember which.
I was thinking that Martin Lawrence was the lead, but none of his titles on IMDB ring a bell.