Well. I feel quite sure that they don't tag the songs with the quote marks.
It's like I would tag all western songs with "song title" everytime... Also... If you would tag A like this; 「A」 then you probably need tag all her songs like that since they always write out songs like that in magazines e.t.c. to point out that it is a song. But the songs name is only A. Just like Mirrorcle World is just Mirrorcle World and not 「Mirrorcle World」 (even though that's how they write it in magazines all the time).
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