Guitar Man demonstrates how to play a basic harmonica blues scale and how to bend a note on a harmonica. Playing a harmonica blues scale is really simple. You can play the blues scale with any G instrument. The blues scale is three blow, three blow, three inhale or suck, four blow, four suck, five suck and six blow. Then repeat the pattern in descending order. Follow the pattern to pick up blues harmonica really quickly. Practice the blues scale pattern and you'll eventually be able to improve on it. To bend a note on a harmonica, pretend you're drinking a really thick milkshake; purse your lips and inhale really, really hard. Keep in mind that some harmonicas are really hard to bend on.