Because it's popular, and many many blues songs are either in A or E, both keys are available easily from the A harp in first and second positions (look them up, especially second). read more
I just came across a blues harmonica from China; it’s the Easttop Blues Harmonica – 008K. In my opinion it is by far the best blues harmonica for the price (about $15), and a terrific harp regardless of price. Great volume, easy out of the box bends, a tight, solid construction. Has become my go to harp. read more
Each verse of a song starts the pattern, the key of the song is best found at this point. Consider a blues jam. Your solo might start after two verses, longer if a guitar takes the first solo. read more