First of all we have already seen this musical when it was called They're Playing Our Song. A female lyricist and male composer try to work together, fight and ultimately make up. Sound familiar?
The cliches were abundant. Of course they were from opposite sides of the social spectrum. I bet the don't get along at first! I mean she's well to do and has a pink door. He's poor and has a black door. I'll take a guess that they'll be both exposed to each other's world and maybe rethink their initial judgements about each other.
Of course they won't do so well as a team at first, but then things will start to click and they'll find some success. This success will only be shattered because they stop getting along for some reason or another. Don't worry, there will probably be a happy ending and they might even find commercial success as well.
****spoiler****
Plus the whole baby thing. Come on. Deciding to have the baby and then revealing to him after two years that he's a father. Then presto they are a happy family and all loose ends are tied up. If only real life always worked out this way.
****end spoiler****
I found it to be very predictable, and almost needs to be billed as an adaptation of They're Playing Our Song (which I'm sure was considered a little cliched at the time too).
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!