I am assuming here that when you are talking about music listening it is 2 channel. As has already been mentioned, 2 channel Cds or equivalent media are always going to be louder than movies inasmuch for movies we are moving to 5.1 and/or 7.1 audio which is always going to be not as loud as two channel. Obviously the sound has to be distributed over several channels as opposed to just two, hence, a drop in volume. One of the reasons for this is to allow for more headroom with the significant fluctuation that occurs in the volume of movies(especially of the action variety)that you don't normally hear in 2 channel music. The only exception to this that I have ever noticed is with SACD or DVD Audio discs. The multi-channel soundtrack I have heard on these discs are quite often as loud as 2 channel CDs.
