For one thing, they can't agree on a single voice.

America must continue to speak with a single voice, as well.

But the Administration does not speak with a single voice on this issue.

Then a single voice announced the numbers for and against.

Then a single voice spoke up from the back of the huge room.

"By working together, we could act as a single voice for the science community."

We need Europe to have a single voice in the world.

To this end, we need to give it a single voice in foreign policy.

What was that we were saying about a single European voice?

Yet we still lack a single voice in the world.