In a message dated Franco di Chicago writes:
And let's not forget that Lily Pons sang at least the Mad Scene in the
original key; she was most likely not aware that she was singing the
original key, but simply transposed it up because she found the tessitura
was easier for her voice. Of course, SHE included all the traditional
There is also a recording of Mady Mesple singing it in what on the LP they
call the French version, the key of Lily Pons, in French, again, with all the
traditional high notes.