So, I guess I promised to tell you the dirty little secret of second position. The secret is also why second position is so popular. Are you ready? The secret is that basically any note you will play in second position will sound at least, okay? You will almost never be out of key. And that is a pretty good starting point.
If you have a C harmonica in your hand, and the band is playing in G major, you can just start playing No worries. The next video is of me playing a quick example.