Yeah - well it seems that somehow or other, you've managed to put your music in the folder belonging to a different user. If you're logged in as "VB2" you're not going to be able to access VB1's music. You'll need to log in as VB1 to fix this.
Various instructions on sharing music between multiple accounts:
http://support.apple.com/kb/HT1203However, I suspect that you actually want to get rid of the superfluous accounts...
Do you have an external HD? If it was me, I think I'd just copy all the music to an external drive (make sure it's all there, safe and sound) and then delete anything on the home drive, then make sure I was in the correct account and then import it all back to where it should be - using the IMPORT function so you don't lose it! Of course if you have playlists etc. that you want to preserve, this would not do that.
You say you've got three user folders named VB2, VB3 and VB0 but no VB1 and yet that's where your music is? How can that be? I'm a little confused. If there is no User folder VB1, then how can the music be there?

Anyway - I think you risk a real mess if you keep fiddling with the users. Get that music copied somewhere safe and start over. Delete any users that you don't need - keep the primary one and work from there.
You do have an external HD, I hope? (Everyone should have at least one complete backup of their main HD....)