Worked With Zappa
In all the many tributes online since her passing, I have seen nary a mention of the time she(and the Ikettes) sang backup for Frank...
'"I wanted to put some back-up singers on the thing, and the road manager who was with us at the time checked into it and said, 'well, why don't you just use the Ikettes?' I said, ''I can get the Ikettes?'' and he said ''Sure''.'
https://www.the-world-of-tina.com/frank-zappa---guest.html