If you’re having occasional trouble opening these zips, I have to suggest maybe switching archive software, as I always check when there’s a complaint and 95% of the time there’s no real problem and I end up re-upping anyway for everyone. What I’ve always found to have a good success rate are WinRar (both OS x and Windows options) or 7zip (Windows). These guys can even pull files out of broken or corrupted archives.
I upload all these albums myself, never re-use another person’s links, and always make sure that at least these two programs can open them first.
Also, I recommend some tagging software. I use Foobar2000 as my main media player and it plays EVERYTHING, and it also has mass tagging extensions, and can tag via freedb or discogs, which are invaluable.
You may notice that tags are sometimes incomplete or garbled tags in iTunes, but they are always 100% good in Foobar or Winamp or even Rhythmbox. I hate iTunes so much I can’t even install it in order to cater to it. I’d apologize for that if I could. I know it’s elitist.