Good point and good reference. I see that in the first case Better Miller won a case against Ford motor company who had a "sound-alike" sing one of her songs for a commercial when she refused. The other cases are similar and my reading of the article is that the cases hinged on 1) a deliverate and explicit imitation of the famous voice concerned and 2) the voice in question being quite distinct, such that it would be very unlikely to approximate it by coincidence. In the case at hand here I think a strong argument could be made either way I both of these points and reasonable people will certainly differ.
