Grammar & Punctuation : When to Use a Comma in a Compound Subject

[707firedragon]

is they one subject? or is it more than one suject? or is it not a subject

[gargantuanstudios]

Your are doing a great job. I watch your videos regularly. I am working on a website. I wont it to have very minimal grammatical errors.

[aaronhallam61]

It's so annoying when people write "Jane, Sue and Pam sing in the choir." I try to tell them there's supposed to be another comma in there, but they try to argue that it's a matter of style. What?! It's a matter of necessity and clarity! Come on people!