Listen to the Blues
Listen to as many blues recordings or CDs as you can to get a good feel for it. Be attentive to the chord changes and try to locate them effectively. You should be able to know the different instruments being played. It is advised to tap your feet and clap to the rhythm of the blues. Count 1-2-3-4 to get the 4/4 rhythm usually present in these type of songs. Concentrate on the 2 and the 4 (shuffle rhythm), that is 1 and the 2 and the 3 and the 4 and the... instead of 1-2-3-4.
Playing the Blues
Do not suck on the harmonica but rather breathe deeply to find your rhythm and draw on hole 4 of the instrument. Draw with the vowel “e.” Then change your tongue position and mouth to say “u.” This will decrease the pitch of your tone. After that, go back between the two vowels. You will realise the pitch changing while you are playing. This is known as bending notes, a skill important for playing the blues. Also, bend on holes 5 and 3 of the harmonica. Do this on all 10 holes and check the differences in how tough they are to bend. You have to close your hands around the instrument when drawing.
While playing the blues, practice opening and closing your hands around the harmonica. Practice the blues scale up and down until you can play on all of the notes easily. Bend notes on holes 4 and 5 as they are mostly used in this genre of music. Also, play along various blues recordings using the instrument in different keys.