Tony and Susan started dating over three decades ago, but there's a chance that they met for the first time much earlier than that. Susan's parents, Marion and Dayl Crow were among the singer's biggest fans. They even asked him for a picture at a concert he gave in San Francisco, Calif., in 1966. 

"As fate would have it, Marion was pregnant at the time with … Susan! It's a photo we all laugh about knowing the incredible turn of events that followed," Tony wrote in his 2016 memoir, Just Getting Started. 

Susan's parents would regularly play Tony's songs while she was growing up, as per MailOnline. In no time, she developed a fascination with his work as well. 

Eventually, Susan became the president of Tony's Bay Area fan club. She even met him at one of his concerts — which is how they first got talking. 

"When she was 19, she had tickets to see me perform at the Masonic Temple in San Francisco, and she put in a request to say hello backstage after the show, probably not expecting a response," Tony wrote in his memoir. 

Tony was married to Sandra Grant Bennett at the time. It's understood that he and Susan started dating after his divorce from the actress.