new feature suggestion

Just a thought on a couple of new features to help improve this wonderful place even more.  Firstly, could we find some way of eliminating tabs that are in the system 15 times but have no rating because they're rubbish . . . but the main feature would be improving the search so that you can select chords that you know and only search for songs that use those chords.

This would be a great help for beginners - an extension of this would be to search for tabs containing only the chords you know plus 1 you don;t . . . kinda a way to find something that you can push towards??