Organise my music collection

I tried to do this sometime last year with my mp3s, but I set the parameters incorrectly on my tagging application and inadvertently re-tagged all my songs with the titles and artists swapped around.

So now I have the likes of ‘Clocks’ and ‘Fix You’ as artists in my music player with tracks such as ‘Untitled’ and ‘Unknown’.

I’ve split all the correctly tagged songs into folders separated by letter, artist and album so now all that remains is to re-tag the 3,000-odd songs with incorrect labelling.

Shouldn’t take too long! o_O