I notice you didnt say they werent mp3's so ill assume they are now.

ignoring the fact
1) MP3s (for the most part) are illegal copies of music.
2) mIRC isn't a filesharing application, and were not ment to help with illegal activities.

Im going to give the benifit of doubt and say maybe there free to distribute mp3's
If mp3's do u relaize that alot of them have an mp3 tag (id3 tag) inside them with data on the song/artist etc etc, this can be used for very effective sorting.
A program like this can be used with great speed to either organize or rename for an organizer to sort.

While its not soley automated, i doubt you ever could, since the filenameing is prettywell random, but the data held in the tag is 90% or more correct most times.