Query Info Dump

I got a question about queries and collaborations and figured that the response I put together might be of some interest to folks here. So, with all identifiers removed:

Start with the collaboration stuff:

An agent will deal with a two-author book in pretty much the same way they'd deal with single author book: Does the query make me want to read the material? If so, does the book make me want to represent this(these) client(s)? Then they'll go from there.

My agent reps at least one pair of author