The Logic Off Topic list

i ain't getting into another OT (or maybe i am)
there are lots of english dialects - each with its own grammar - a 
description not a prescription.
e.g. "I got plenty of nothing" is perfectly grammatical in some 
american black grammars.
it is used consistently, it is meaningful and it conveys subtleties of 
its own.

come and comes can both be right.
it depends on the way you mentally parse the sentence.
"Chris & Marty" can be reevaluated gramatically as a single entity.

imagine coloured guitars falling out from the sky...
"here comes green....  here comes blue.....
here comes red and white!"

in any case in this example it is the "here" which is singular 
therefore "comes" as teddybut said.

this is the same as "chris and marty WERE singing". the singing WAS 
chris and marty"
"singing -  also singular".

steve parker