
"An eccentric, if not charming Southern professor and his crew pose as a classical ensemble in order to rob a casino, all under the nose of his unsuspecting but sharp old landlady." They rent her basement adjacent to their target and use the ruse of band practice to cover the sound of their tunneling.
The original British version of that movie was much better.
https://en.wikipedia.org/wiki/The_Ladykillers_(1955_film)