The phrase:
"You've gotta' dance like there's nobody watching,
Love like you'll never be hurt,
Sing like there's nobody listening"

Although Purkey is the source of this quotation, it has been attributed to many others.
Lines from it were included in the song Come From the Heart written by Susannah Clark and Richard Leigh in 1987:
You got to sing like you don't need the money
Love like you'll never get hurt
You got to dance like nobody's watching'
It's got to come from the heart if you want it to work.


William Purkey takes credit for "most" of the wording, but admits many people have said similar phrases. Which person is most likely to have started this saying?