An overblow on harmuponica is a note obtained with very advanced technique that most of the time requires to create the harmonica. Reed gap adjustment and embossing are a few of the modifications that help to obtain the overblow. Overblows allows you to play chromatically and have more notes on the instrument; for instance, on a C harmonica, on hole 1, you may get a D sharp, as well as on hole 4. On hole 5, with the overblow, you can perform an F razor-sharp, whereas, on hole 6, you will discover a B flat. The B smooth on hole 6 is essential for playing the second position blues scale on the higher section of the harmonica. With overblows, it is possible to play far better jazz music because it makes large usage of chromatics.