All I recall is that it was set in Ireland (I think) and was about a group of musicians who formed a band and became popular (mostly as a bar band and mostly doing covers, I think). The cover that I remember most distinctly was “Mustang Sally”. I think the movie was released in the 1980’s and I believe that it was contemporary (but I’m not certain about either of those).
I want to say the title was “The _________” (where _______ was the name of the band).
I’m at a loss… can anyone help?