Another sound commonly used by harmonica players is throat vibrato. This is another way of adding expression to a note once it has sounded. The sound is made with a similar movement to both laughing and coughing. Try saying ha ha ha ha very quickly as you breath in. Then try it breathing out.
Then try the same thing as you play a note on the harmonica. Listen to the CD to hear the effect produced by throat vibrato. Like note bending, this technique can take some time to master, so be patient and stick with it. Throat vibrato is indicated by the symbol placed after the hole number.
To finish this section, here is a Blues solo which makes use of all the techniques you have learnt. Take it slowly at first and listen carefully to the CD to get all the expressions. Once you can play this one, you are well on the way to being a good Harmonica player. Make a habit of improvising with the Jam-along tracks at the end of CD2. The progressions are described on page 178. As well as this, you should start playing regularly with other musicians.