I always turn a simple answer into something complex.
"the tune keeps be played over and over."
could be changed into:
"The melody possesses a reiterating phrase-an osinato."
What you need is a musical dictionary, i can find lots of long posh sounding words at the flick of a page..
gerbunden=(German) Bound. Used musically in the sense of 'tied' or 'slurred'.
quilisma=((Latin) most important of decorative neums, something like a trill.
tornada=(Spanish) Type of refrain in many of the folk-songs of catalonia.
See. learn a few words and you'l be on your way to sounding like a musical genius. MWA HA HA...