Is it at all possible, after downloading a new block of music, to figure out which of the songs in Emplode have just been downloaded, after the downloading has been finished?

The Rio definately being a labor of love, I have set up oplaylists alphabetically by artist A-E, etc. then all of the A's, the B's and so on......if I downlod a bunch of new songs, how can i be sure that when I update my playlist that I have captured ALL of the songs that I have downloaded???
Thanks,

Ed