Basil's post titled "Once" reminds me of the movie by that name.
Here it is still showing at the Palo Alto Aquarius theater and it is possibly the best "Musical" or movie about music that I have seen in a long time. Takes place in Ireland and the main actors are also the real musicians. Nicely filmed, nicely paced poignant story about people in love with music.
Not Hawaiian in this case but Irish/English folk/pop music.