Dogeared

From Margaret Atwood's Lady Oracle:

For a while I wanted to be an opera singer. Even though they were fat they could wear extravagant costumes, nobody laughed at them, they were loved and praised. Unfortunately I couldn't sing. But it always appealed to me: to be able to stand up there in front of everyone and shriek as loud as you could, about hatred and love and rage and despair, scream at the top of your lungs and have it come out music. That would be something.

(What is dogeared?)