Dragon and Tennille met in the early 1970s, and quickly began performing together.
' Love Will Keep Us Together, ' the title track from the duo's 1975 debut album, reached No. 1 in the US in July of 1975 and won the top Record of the Year prize at the following year's Grammy Awards.
Tennille was at Dragon's side when he passed, publicist Harlan Boll told CNN.
The 78-year-old said: 'He was a brilliant musician with many friends who loved him greatly. She was with him when he died. In September 2010, Tennille publicly clarified her husband's condition as "a neurological condition (later confirmed to be Essential tremor), which caused him to have tremors, according to a Wikipedia entry". He would later serve as Captain & Tennille's producer.
The couple chose to split in 2014, but they remained close over the years, and she reportedly moved to Arizona to take care of him.More news: New Update On Pittsburgh Steelers WR Antonio Brown
Dragon once played keyboards for the Beach Boys, where he was first dubbed "The Captain" by singer Mike Love.
Before Dragon's foray into traveling with the Beach Boys and then Tennille, he started a musical career with the Wright Sounds. "He took 'Love Will Keep Us Together, ' made it his own with the magic of his playing and her incredible voice". Reaching the height of their popularity in the 1970s and early 1980s, the couple married and had five albums certified gold or platinum, scoring numerous hits on the United States singles charts and hosted their own television variety series on ABC in 1976-77, according to Wikipedia. He was a classically trained pianist but preferred to play blues and boogie music instead of Bach and Beethoven.
"Whether in the studio, on stage or just hanging out, he was loved by all of us who had the pleasure of knowing him", the Beach Boys lead singer, 77, continued.
While another added: "RIP Daryl Dragon".
Dragon is survived by his brother, Doug Dragon, and nieces Kelly Arbout and Renee Henn.