Guercio was The King of Rock 'n' Roll's musical director and conductor from 1970 until the star's death in 1977.
As well as working with Presley, he was also played music with Patti Page, worked on arrangements for Barbra Streisand, and performed at the Vatican for Pope John Paul Ii.
Actress Priscilla Presley says, "I am so sorry to hear about the passing of Joe Guercio... His musical talent was unsurpassed. Elvis loved working with him. We have all lost a great man and a true gentleman."
Chief Executive Officer of Elvis Presley Enterprises, Jack Soden, adds, "All of us at Graceland and Elvis Presley Enterprises are deeply saddened to learn of the passing of Joe Guercio. He was a dear friend and loved by all."