What's the Name of That Book??? discussion

Looking for an older YA title that features a performing troupe that helps smuggle people from Denmark to Sweden during WWII. Not "Number the Stars." The first line of the book is something like ...as Hitler was coming to power in Copenhagen, King Lear was asleep on his throne.

Lisa's War by Carol Matas?

Brenna, around what year did you read this book? A range of years is fine.