he was not on the Johnny Cash because Johnny Cash show only ran from 1964 to 1971 but Elton John was on The Muppet Show
Johnny Cash (apex)
He recorded his songs in a studio and then he put it in the show.
The Johnny Cash Show - album - was created in 1970-10.
The Johnny Cash Show - 1969 - 1.12 was released on: USA: 30 August 1969
The Johnny Cash Show - 1969 - 1.15 was released on: USA: 27 September 1969
Johnny Cash (apex)
The Johnny Cash Show - 1969 The Johnny Cash Christmas Show 2-13 was released on: USA: 25 December 1970
He recorded his songs in a studio and then he put it in the show.
The Johnny Cash Show - album - was created in 1970-10.
Yeah, he even got his own show : The Johnny Cash show.
The Johnny Cash Show - TV series - was created in 1969.
How should I know? Ask Elton John.
The Johnny Cash Show - 1969 was released on: USA: 7 June 1969
The Johnny Cash Show - 1969 - 1.10 was released on: USA: 16 August 1969
The Johnny Cash Show - 1969 - 1.11 was released on: USA: 23 August 1969
The Johnny Cash Show - 1969 - 1.12 was released on: USA: 30 August 1969
The Johnny Cash Show - 1969 - 1.13 was released on: USA: 6 September 1969