[escapefromboston]

Jeez. Just put up a sign “Perry Como” under the photo

[No name given]

Exactly.

[verum ago]

Jeez. Just put up a sign “Perry Como” under the photo

This. Simple. And it'd work.

Heck, plenty of places with signed photos do this anyway, because signatures are often illegible and the photos are often old enough many people don't automatically recognize the person in them anymore.