"I think there are an awful lot of artists around who are very good at leading us into hell," Tavener once said. "I would rather someone would show me the way to paradise."
An imposing figure, Tavener was strikingly tall — 6 feet 6 inches (198 centimeters) — thin, and wore his hair long.
James Rushton, managing director of Chester Music, called Tavener "one of the unique and most inspired voices in music of the last 50 years."
"His large body of work — dramatic, immediate, haunting, remaining long in the memory of all who have heard it, and always identifiably his — is one of the most significant contributions to classical music in our times," Rushton said.
Tavener's music was distinguished by quiet passages which seemed to shimmer like dawn light, and by its other-worldly intensity and moments of ecstasy. He spoke of some compositions arriving instantaneously in his mind.
"If one is going to create this eternal, celestial music, one has got to listen, to be silent, to hear the angel of inspiration dictate," he said in his 60th year.
Tavener was born on January 28, 1944, into a music-loving family in north London. At an early age he began to improvise and compose at the piano. As a teenage organist in a Presbyterian church, he conducted adventurous modern works including Michael Tippet's "A Child of Our Time," Benjamin Britten's "A Ceremony of Carols" and Igor Stravinsky's "Symphony of Psalms."
Abandoning an ambition to be a concert pianist, Tavener studied composition at London's Royal Academy of Music.
In the late 1960s, his cantata "The Whale" brought him fame with the help of The Beatles, who released it on their Apple records label.
Tavener said he caught the attention of John Lennon and Yoko Ono at a party by playing a tape of his opera, "Notre Dames des Fleurs," inspired by Jean Genet's novel about a prisoner's sexual fantasies.
The opera — which was later lost — featured obscene lyrics, a choir and what Tavener called his "thunderous" performance on the organ.
Lennon offered a recording deal the next day, Tavener said, but it needed another Beatle to get "The Whale" to market.
"It took Ringo, who is a lot more pragmatic than John," Tavener said in a BBC interview. "Ringo actually brought out 'The Whale' and 'Celtic Requiem.'"
"The Whale," he said, "was a piece written by an angry young man ... because the world didn't see the cosmos in metaphysical terms."
Tavener's later, better-known works flowed from his conversion to Orthodox Christianity and his collaboration with Mother Thekla, a Russian emigre and Orthodox nun to whom he turned for support after his mother died in 1985.
Thekla's short "The Life of St. Mary of Egypt" inspired his 1992 opera, "Mary of Egypt," and she provided many of the librettos for other works.