In An Instant (2015)

S1E27 Rooms for Rent

Frustrated by their husbands' constant grumbling about money, Wilma and Betty decide to rent out rooms to student musicians who play piano and bongo drums. Fred and Barney, oblivious to the true nature of the arrangement, think it’s a great idea. Meanwhile, the wives are secretly trading the accommodations for music and dance lessons, adding a fun twist to their lives.