I'm only a freshman and I'm only on Arbans book. I have a good sound and technique, but my range is as stated in the book. Ultimately I've hit a plateau with my range. Like Arban says in his book I can play a Bb decently, but anything after isn't pretty. I'll peak at about a C or C# with a 3C. So what would be some good books to look into to increase/clarify my range? Suggestions are appreciated thanks.