The Diplomats are just a little bit off key from what others are doing.

She took up the chorus lustily, her voice gratingly off key.

But it's the President who's singing off key.

Jane could hear her singing, slightly off key, in the kitchen.

Sometimes you can get them mad enough to say something off key.

And the bad is the voices of two men singing together, off key.

Little conversation here, except that one gal keeps singing off key.

There was the sound of copper bells, slightly off key, and the little green demon appeared.

He then showed me that he was singing along (at the top of his voice, totally off key) to a tape.

After the last waltz, drunks begin to sing their old favorites off key.