Heavyweight Latin funk from 1968: In case you're unacquainted, "Happy Soul" is the ultimate super-swing sample source of Christina Aguilera's "Ain't No Other Man", and remains the most distinctive cut in Cortez & The Moon People's extensive repertoire. We head over to Cuba for the B-side as La Lupe digs deep with a sun-splashed salsa cover of "Fever". Swelteringly good.