Is it true that after Al Jolson dubbed Larry Parks singing voice in The Story an unhappy studio got a vocal impersonator named Walter Craig or Grant to replace most of Jolsons voice?

You are referring to a popular myth about the film *The Jolson Story*. While it's true that Larry Parks didn't actually sing in the film, it's not true that his singing voice was replaced by another voice actor.

The reality is:

* Al Jolson's voice was used extensively throughout the film.

* Larry Parks did sing in the film, but his voice was limited to a few songs and spoken dialogue.

* The studio, Columbia Pictures, was not unhappy with the results and considered it a success.

The rumor likely arose from the fact that Parks had a singing voice that wasn't as strong as Jolson's, and some viewers may have noticed a slight difference in vocal quality between different scenes. However, this was intentionally done by the filmmakers to show the evolution of Jolson's voice.

In conclusion:

* Al Jolson's voice was the primary vocal source for the film.

* Larry Parks did sing a few songs, but his voice was not entirely replaced.

* There was no need for a "vocal impersonator" like Walter Craig or Grant.

The myth of a studio replacing Jolson's voice with someone else is just that - a myth.