4 draw

The 4 draw is the most over-used note on the harmonica in 2nd Position soloing for good reason... it can be presented in many ways (single, double, shake, slap, flutter, octave, etc.) and is a great launching pad to move up or down the harmonica. Today's law is that it's rare to play the 4 draw by itself, it's commonly presented with a touch of 5 draw in it to thicken its texture (what Joe Filisko calls "Dirty Notes"). The challenge is just to add a touch... too much and it becomes overly dissonant.