Full of artistry and soul, Marvin Gaye and Tammi Terrell’s ‘Ain’t No Mountain High Enough’ is a pinnacle of pop music that cannot be surpassed.It was one of the most glorious achievements in 60s music, rising from a delicate opening to a shattering climax. If the 60s gave us the love generation, here was an anthem full of love. If soul was about physical passion in a gospel context, this song is its apex. Full of artistry, Marvin Gaye and Tammi Terrell’s “Ain’t No Mountain High Enough” is, fittingly, a pop pinnacle. Though its roots lie in gospel, the song...