Ok, here's the clip of Mick talking about his harps. He has all the harps in all the keys in one box.
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I use Lee Oskars too, but I have found Hohners to be great also. I mainly use the harps in the keys of E,D, and A.
With those 3 keys you can cover a lot of Stones songs. As already posted if you want the blues sound you would use an E harp for a song in the key of 'B', a D harp for a song in the key of 'A', and an A harp for a song in the key of 'E'.
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