Can "比" go without a subject? Take a look at this sentence.


  比那刘姥姥进了大观园，还要土里土气


For some reason I translate this sentence as "Compared to A, B is more ...", though this doesn't make any sense to me.

Although I found this sentence in a song (which I think could be incorrect), I'm curious if this is a correct and valid sentence. Is this a correct sentence? If it is correct, what nouns are being referred to? Any help would be greatly appreciated.
[比 (object)，还要 (adjective)] = [ more (adjective), compare to (object)]


比[那刘姥姥进了大观园]，还要[土里土气]
那刘姥姥进了大观园 is  the object phrase
土里土气 is the adjective phrase


The subject is omitted in this sentence, but it is there. 

You have to have a subject to compare to an object: "Subject' (omitted) 比 [那刘姥姥进了大观园]，还要 [土里土气]"

The subject can be a noun, or another phrase