He's been celebrating the 50-year anniversary on social media by posting vintage photos and memories. The tune has charted on the Billboard Hot 100 repeatedly over the years, and become one of the most played and recorded Christmas songs around the world.
It was part of Feliciano's 1970 self-titled holiday album, later renamed Feliz Navidad." He says "We Three Kings" and "The First Noel" served as inspirations.
"I didn't want to do a Christmas album that was syrupy," he said, but one "that really told the story of the savior's birth in a way that was musical and people could get behind it."
A documentary about Feliciano, who has been blind since birth, is expected to be released next year. Behind This Guitar tracks his journey from poverty in Puerto Rico and New York to performing at the Vatican's Christmas celebration.
"The cards that were given to me were not such great cards to deal with," Feliciano said. "I came from a foreign land, I had no vision, or at least I thought I didn't — until I found out that I did have a vision and that I saw things the way they should be seen."
Feliciano is also hosting a concert featuring Feliz Navidad in December and his versions of other Christmas carols livestreamed from his Connecticut home.