I truly believe that at its best music is an expression of one's personality and mood can definately effect it. When I'm angry my improvisations will tend to show it. If I'm sad, some darkness may come through. When I'm happy I always rush the beat! Just kidding about rushing, but I think I understand why that happens to you, and I think it's pretty normal. From interviews with, and a few personal meetings with players I've found that my favorite players are also likable people. Some of my least favorite players musically, seem to be less likable people as well. We are all, simply expressing "ourselves" right?