Singing and Breathing
Singing lessons have helped me a great deal in learning to play harmonica. In addition to pitch recognition when bending, vibrato, tremelo, and dynamics, it has helped my breathcontrol. I was having a hell of a time with "Swingin' With George" over the summer. I just couldn't get the breath control down no matter how I tried. After a couple singing lessons where I learned about breath control and expanding you rib cage for "support", I picked up the song again and was able to learn it in a couple days without problem.