Still not relevant. There are several studies on the impact of music and the role of familiarity, structure, anticipation and such. There's even one decicated to the use of such musical notions in the music of the Beatles ( http://www.amazon.com/Songwriting-Secrets-Beatles-Dominic-Pe... ).
For one, sticky songs (hooks) can also be unpredictable/unexpected. E.g. you're not able to predict what will follow from the first part you hear, but it sticks to your mind after you do hear it in full.
Second, there are hooks where you DO hear "what comes next before" (e.g. they are based on repeatition of notes in the core hook) and that doesn't stop them being sticky.
For one, sticky songs (hooks) can also be unpredictable/unexpected. E.g. you're not able to predict what will follow from the first part you hear, but it sticks to your mind after you do hear it in full.
Second, there are hooks where you DO hear "what comes next before" (e.g. they are based on repeatition of notes in the core hook) and that doesn't stop them being sticky.