I am sorry I have been a leecher, but I never really had anything to contribute, UNTIL NOW!!
The video below is a demonstration
[ame="http://www.zshare.net/download/7031150814d956d6/"]zSHARE - WowBgTweaker_v3.0.rar[/ame]
1. Extract folder WowBgTweaker_v3.0 to anywhere on your computer.
2. Inside the folder will be WowBgTweaker_v3.0.Jar, Run it with Java.
3. Set Path to your world of warcraft directory, & Choose either Wow.exe(windows)
or World of Warcraft.App(for mac
4. Check the box "Select login screen background" Choose Custom, then choose the
one you prefer.
5. Check the box "Select login screen music:" You can either have Original(WOTLK)
No music, or choose an mp3 file & have it as your login screen music.
6. Click apply, enjoy
All Credit goes too Zl0br
Free File Hosting Made Simple - MediaFire
VANILLA WOW LOGIN MUSIC!!