Ever since I saw Marvel's Ant-Man I often wondered how The Partridge Family came up with Come On Get Happy as it's theme song? Because it's really upbeat and fun and I can see why Ant-Man "Scott Lang" likes to sing karaoke to it in the movie. Was Come On Get Happy The Partridge Family's first big hit and that's why it was used as the official theme song in the second season of The Partridge Family?