In 1967, Campbell released his sixth studio album Gentle On My Mind. The album was a smash success, and climbed to the top spot of the Billboard Country Albums chart. It also crossed over to the Billboard pop charts, where it peaked at the fifth position.
Campbell only released one single off of the album, which was its title track. The single "Gentle On My Mind" was just as successful as the album itself, and as of today, has been played on the radio over 5 million times.