If someone is both a singer and a writer, I would normally say "a singer and writer". When I say "a singer and a writer", it should mean that there are two persons, one is a singer and the other is a writer.
I'm trying to figure out how to introduce two or more people, all of which are singers and writers at the same time. How should I properly express this without confusion or ambiguity? I'm finding "singers and writers" potentially meaning "some singers and some other writers" and thus ambiguous.