After a recording hiatus during which Campbell toured heavily, he followed this up in 1975 with another Grammy for the best record Rhinestone Cowboy which contained his signature hit song of the same name, and then another in 1980 for best record by a duo, which was Dream Lover with Tanya Tucker, his much-younger fiancé.
Campbell won five Grammys, sold more than 45 million records, had 12 gold albums and 75 chart hits, including "Rhinestone Cowboy". He had originally recorded with the group the year before, but when band leader Brian Wilson suffered a nervous breakdown in December 1964, Campbell was hired to take his place on tour, playing bass and singing harmonies.
Campbell recalled meeting Urban when he was still an up-and-coming musician during a trip to Australia and giving him the advice to always keep practicing - advice Urban admitted he was still following to that day, years into a successful career.
"He wanted to tell the story of his Alzheimer's disease", Keach told America's ABC News.
"He was a wonderful session musician as well - a lot of people don't know realise that but he could play anything and he could play it really well - so he was just extremely talented".
Campbell died in Nashville Tuesday morning at the age of 81.
He is being remembered for his talent as a singer, songwriter, TV host, and actor.
Glen was inducted into the Country Music Hall of Fame in 2005, and released his final album "Adios" - which was a compilation of covers recorded prior to his retirement - earlier this year.
Our thoughts are with Campbell's loved ones during this hard time. The donations will benefit the Glen Campbell Memorial Fund.
The Jolene singer, 71, posted a video message on Twitter and wrote: "Glen Campbell was one of the greatest voices of all time".
In a statement issued Tuesday night to his official Facebook, Urban paid tribute to someone he considered his "role model".
Summary: It's a hard time for country music fans around the world as they are mourning the loss of the legendary Glen Campbell.
Campbell was awarded with the Grammy Lifetime Achievement Award in 2012. "I miss you already", commented soberly Miley Cyrus.