iDouble Bass is brought to you by Micah Howard, double bass professor at Carnegie Mellon University and longtime member of the Pittsburgh Symphony Orchestra. Learn how to hold the bass and bow. Learn about vibrato, pizzicato and so much more with videos, text, and dozens of photos. And for a one-time in-app-purchase of only $0.99 view, print and share scales for beginner to advanced students. This app is ideal for the novice to the seasoned professional — for teachers and performers.