Jim Carroll has previously mentioned Ewan MacColls technique of improving breathing technique by using rocky road to dublin,
he also used songs for improving diction
"One of his exercises was to sing 'Tail-Toddle' - a verse and two choruses, in one breath - saw him do it only once
https://www.youtube.com/watch?v=ekFZAN2cJ6s
https://www.youtube.com/watch?v=0JNvXOt4ICc
https://www.youtube.com/watch?v=am1F" QUOTE JIM CARROLL