Try playing long-held octaves with tremolo for accompaniment... just like an organ. Listen to George "Harmonica" Smith's "Mrs Bessie May" for a great example. Try 2/5 for the I7 Chord, 2+/5+ for the IV7 Chord and 1+/4+ for the V7 Chord.
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After watching the BluesHarmonica.com overview video, try one of the lessons below to experience a lesson at BluesHarmonica.com.