I too use music during the day & just never turned it on at night. Charlie never seem to have a problem with it, he always goes down at night no worries. It's what lets him know its nap time, though I mix things up a bit so he doesn't get used to just the one CD....often I just let the radio play. For me its more about having the sound but now that you mention the names of those other CD's I might give them a try as he doesn't often go past 40mins without me having to resettle him & yesterday he wouldn't resettle & he had 4 naps!! Also if you do go away it's easy to pack the CD if there will be a player available....or we have an ipod with some small speakers we took the last time we had to stay in a hote.