Singer Scott McKenzie, the voice behind the iconic 1960s song San Francisco (Be Sure to Wear Flowers in Your Hair), has died at the age of 73.

McKenzie died Saturday in Los Angeles, according to a statement on his website.

The singer had been repeatedly admitted to hospital since 2010 and had been battling the neurological disorder Guillain-Barré syndrome, the singer's neighbour told the BBC.

Teen singer

Born Philip Wallach Blondheim, the singer, songwriter and guitarist was raised in North Carolina by his grandparents.

As a teen, he met The Mamas and The Papas co-founder John Phillips and the two joined together on various musical endeavours, including vocal groups like The Abstracts, The Smoothies and The Journeymen. After moving to New York, he adopted the easier stage name, Scott McKenzie.

Though McKenzie declined Phillips' invitation to join The Mamas and The Papas in order to pursue a solo career, the pair remained friends.

Phillips, a memorable songwriter whose works exemplified the 1960s counterculture scene, was responsible for penning, co-producing and playing guitar on McKenzie's famed track San Francisco.

Summer of Love anthem

Adopted as an anthem of 1967's Summer of Love and later considered one of the signature tracks of the 1960s era, the song would become McKenzie's biggest hit worldwide. He often dedicated performances of it to Vietnam veterans.

"Never before or since, with the exception of rap, has popular music contained such sheer poetic and social power," he wrote of the era on his website in 2002.

"Even at the end of the decade, when so many of us had lost hope, when the summer of love had turned into a winter of despair, our music helped keep us alive and carry us forward into a world we had hoped to change."

McKenzie dropped out of the music scene in the late 1960s, but returned about two decades later to fill in as a touring member of The Mamas and The Papas.

His other credits included co-writing the hit 1980s Beach Boys song Kokomo with Phillips, Mike Love and Terry Melcher.