I'm really excited because we're playing this piece here at school. Its really a blast to play. But, I have a question about one notation that is in the piece (I think this is the right forum). There is a spot when we have normally notated A (top line of the staff) but then it is tied to the same pitch but as a hollow diamond. The next bar is a "half note" tied to an "eighth note" but both of them are diamond shaped note head. I know this has something to do with harmonics but I'm not sure what. Thanks is advance and moderators please move this if its in the wrong forum. Thanks again.