I can't really put my finger on it, but I've noticed in the songs I like there is something in the melody that just has to be right. Some form of melodic conclusion that has to be reached or the music will likely leave me feeling like you feel when you're about the sneeze and the it just never happens. I guess the word I'm looking for is "unfulfilled."
Alihan Samedov's Sen Gelmez Oldun is one such song. In fact the oboe like instrument does exactly the kind of melodic trip it has to do in order to become just perfect! I simply love that melody!