"You Don't Have to Be a Star," Marilyn McCoo and Billy Davis, Jr. (1976)

A married couple teaches us how to love

Peak: #1 on the Hot 100
Streams: 9.5 million

Marilyn McCoo and Billy Davis, Jr. have been married since 1969. That’s remarkable for any couple, but it’s even more impressive for a couple of pop stars. Their lives fit together as naturally as their voices do.

And their voices sound like they were made to intertwine. McCoo and Davis first worked together in …