Sisters of Swing at the National Jazz Festival.
Trudy Lile's father used to get her off to sleep by singing old World War II songs.
Now she sings those old Andrews Sisters classics herself, and it takes her right back.
"And that's what we want to do," she says, "take people back in time to that really early jazz,
swing era for 90 minutes."
Three-part harmony singing is not just for older people, she says, it still has great appeal for the children of baby boomers. And of course, jazz fans.
"But it's not just for the jazz community. Swing dancers love it...you also have people that don't know anything about jazz but they know the songs and it has special significance for them," Trudy says.
It also appeals to fans of barbershop singing.
