Agree, but
There IS only one girl in the classroom.
1. The girl in the classroom started to sing a song.
2. A girl in the classroom started to sing a song.
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Are both okay? What about the explanation.
1. The specific girl that we mentioned before or we know already started to sing. There are only one girl in the classroom. There may be boys there. Or there may be some girls, but the girl means which we mentioned before. (for #1)
2. There are lots of girls in the classroom. One of the grils started to sing a song. (for #2)
So #1 and #2 are grammatical, but the meaning is slightly different.
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