atiels and Music?

My little Jareth likes a lot of Alela Diane's music (I think its all the whistling!) it seems to be the only thing he whistles and sings to, except for the Twisted Nerve music from Kill BIll and lord knows I'm trying to discourage that! WHen I play him music sometimes he looks like he's falling asleep, his eyes droop and he goes all puffy, as soon as the track changes hes alert and then sleepy again over and over. My question is, is the music making him relaxed or is it boring him? Got to keep the little guy entertained!