Chidrummer, I took the grand studio tour on this forum and found that Ed Wingate’s Golden World on 3246 West Davison became Motown’s studio B after Berry Gordy bought it in September 1966. On Google Maps I came up with the picture below. Is this what it looks like today?

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And I might take you up on your offer to help me with the list of site to visit. I´ll post it later on, when I have made my first selection.