I am looking forward to the day when getid3 performs writeback to .wma files. Any idea when that will be?
Also,
Any particular reason that you left "WM/AlbumArtist" out - when retrieving info from wma files? I just added it to my 'getid3.asf.php' and it seems to be ok.
ASF tag writing is on the wishlist, but there is currently no ETA for implementing it, sorry :(
The only reason WM/AlbumArtist was not included was that none of my sample files had the artist value stored there. This has been added for getID3() v1.6.3 - thanks! :)