Marvin Gaye’s 1969 hit “Too Busy Thinking About My Baby” overflows with happiness. In the song, Marvin insists nothing can bring him down because he’s so in love. His exuberant vocals over the upbeat horns and groove took the song to No. 4 pop and No. 1 R&B. It perfectly captures Marvin in a carefree, lovestruck mood.