Biritish girlgroup the Sugababes from the 2000s were replaced one by one. And in a Thomas Hobbes Ship of Theseus expansion pack twist, the original three members got back together again.

First thing that came to mind! The ultimate Berlin Twink fantasy!

Then again I wonder, does that really matter? Someone is writing those songs and they have a clear handwriting, so it is almost certainly herself. Also many of them are very good as well (although maybe not for you).