You are quite correct about that
JEAN 'TOOTS' THIELEMANS is a superb Jazz Harmonica player and also one of the top Jazz Guitarist. He played with George Shearing for many years. I remember seeing him as a guest on a TV show several years ago, with Oscar Peterson. He talked about the two hour 'One Man Show' he was doing on Guitar - can you imagine that ??
I believe he played the harmonica on the Midnight Cowboy soundtrack.
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Willum