I confess I found this film irresistible. It's primarily a vehicle for a terrific score, consisting almost entirely of the superb performances and arrangements of Joey DeFrancesco (Frank D). What a pleasant showcase for classics from sorely missed show tunes and jazz of the 40's and 50's, all capably rendered by Amy Adams and Scott G. Anderson. DeFrancesco, incidentally, not only plays the Hammond B, but also piano and trumpet in the movie score (though his Frank D is seen performing only on the Hammond B in the film itself). The film seems to have been somewhat inspired by Steve Koves' Fabulous Baker Boys (1989), though it's not up to the outstanding production values of that film, or the first-rate performances of Jeff and Beau Bridges and (especially) Michelle Pfeiffer, who received an Academy Award nomination. Nevertheless, I thoroughly enjoyed Moonlight Serenade for ALL the reasons that others who posted here have already pointed out. It was great to hear these wonderful, time-tested classical popular and jazz compositions again. I own the film and would love to find the sound track, but no luck so far.
