...Somehow I think this fits quite well. I imagine how good of a singer she can actually be?

I agree. I think she would be a good singer.

She would have the voice of an angel

I've actually been thinking about this a lot recently. When Tenshi is rebuilding the shrine, she takes off a day to go sing in heaven. Since she would just ignore everyone if they told her she was required to attend, this implies Tenshi enjoys singing and wanted to be there.