Reply To: So should I daven mussaf?

Kozov: Tosfos divides the Chiyuvim in a T’fillas Rosh Chodesh. He says there’s a Chiyuv T’fillah and then a Chiyuv to add Me’ein Ham’ora. And that can’t be accomplished by simply adding an additional T’fillah without that Me’ein Ham’ora. On a day that creates its own Shmoneh Esrei, though, there’s the same Chiyuv T’fillah as always, it’s just in a different form.