I Do by The Mighty Marvelows

This was a number seven hit in the R&B charts for The Mighty Marvelows in 1965. It's a two-and-a-half-minute minor masterpiece of eccentricly harmonized doo-wop. I wonder whether the Funk Brothers were listening to this when they came up with Frank Wilson's sublime 'Indeed I Do' for Motown a few years later?