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#3

Each of these people is credited individually.  They're not credited as a group.

So when I see Gerry & Sylvia Anderson (just taking the first credit as example) I see Gerry Anderson and Sylvia Anderson.  I don't see Gerry Anderson credited as Gerry & Sylvia Anderson.  He's credited as Gerry Anderson and she's credited as Sylvia Anderson.

I see in the same vein as an invitation ... say I invite my cousins to a function.  I send the invitation to Mr. & Mrs. Weisert.  This does not mean they are invited only as a couple.  If only one is able to attend, the invitation still stands.

As far as Martian's argument toward band credits, if a credit read the band's name, I would credit the band as a unit.  So if the credit read "The Rolling Stones" I would type that.  If the credit had "The Rolling Stones" as a header with Mick, Keith, Ron & Charlie's names below, I would enter it that way.  If the credits were simply Mick, Keith, Ron & Charlie's names, I would not enter them as "The Rolling Stones."  Band credits do not apply in this case, since the individual names are listed.

The only issue I have that involves band names that is like this, is when the credit reads something like "Benny Goodman and His Orchestra."  I am uncertain how to handle these sorts of credits, which we really only see in older films and are virtually identical to this problem, but locally have been using "Benny Goodman" and "Benny Goodman's Orchestra."