Sadly, this classic has become the Sex Panther of love songs — slapped on copiously by desperate men who think its powers of persuasion are a bedroom guarantee. It no longer works that way, or so I hear. While Let's Get It On's erotic potency has been diminished by time and massive over-exposure, Gaye's opening — "I've been really tryyyyying' baby/ Tryin' to hold back these feelings for so long" — remains the Mt. Everest of on-my-knees vocal performances.