What an odd coinicidence - I was recently putting toegther a CD for my young nephew (age 3 years) and included this song as well as Frank Mills' one other "hit" Peter Piper, which is very similar. When I saw the title of this thread, I assumed it a=was a mudcat joke - you know - Lyric Req for an instrumental song?
Anyway - if anyone should care, you can get both Music Box Dancer and Peter Piper on iTunes. however, be sure to play the samples because Mills did a few rerecordings for later "Greatest Hits" rereleases and they are full onf synth crap background.
Yes, these are those tinny sounding piano hits from the mid 70s if anyone was wondering. Not nearly as good as Floyd Cramer's Last Date, but along the same lines I guess. I must confess, I have Floyd Cramer's Greatest Hits in my CD Collection!