Music students, this one's for you! Music Interval Trainer is the ultimate ear training app for learning and practicing music intervals. You can quiz yourself along a three octave span on intervals ranging from the unison to a perfect 11th. The interval range and order is totally customizable: you can choose to practice on only a specific range and select an ascending or descending playback order. There's even a nifty musical hint mode that will help you figure out the answers when you're stuck.