I am not sure whether this was a mistake but I would most definitely NOT recommend making a post that has no content other than its title if you wish to receive help from other users!
However, importing music tracks (files) is very easy. You need to be working in Timeline view. Simply drag the music file onto one of the workspace tracks (other than the one which holds your images and videos). It will appear as an "object" on the timeline; just drag its start to the point in the show where you want it to be first heard.