r/Falsettos

Just watched this show for the first time (loved it)

I'm being a dumbass and am not understanding what the point of March of the Falsettos is, what does "Falsettos" mean? Seems to be some kind of comment on masculinity but I have no idea what that has to do with the rest of the show.

I'm not sure if this is the right place to ask but I'm shooting my shot ; does anyone here know where I could watch William Finns other works? I've adored Falsettos for a little bit and am really eager to check out his other stuff, but the one problem is that I'm not sure where to find them. If anyone has any tips or maybe even links I'd greatly appreciate that :)