Aris Christofellis, a falsetto sopranist, has done much to fill a gap in recordings, that of the soprano castrati who dominated Baroque opera, oratorios, cantate, etc. 80% of all operas were written before 1800, and 70% of the roles were alto or soprano castrati. Whereas up to 5000 boys per year were made castrati during their heyday, we now have only about a half dozen natural male sopranos such as Radu Marian, Randall Wong, Michael Maniaci, Jorge Cano, David Korn, and V. Kagen-Paley. Too often, beautiful vocal music either has been ignored or assigned to women with distinctly female timbre and too often heavy warbling and sloppy technique, an anathma to castrato vocals.
Some "music experts" have criticized Aris' sound as unpleasing. A grown man with changed voice, using only partial voice, is bound to have to some degree a more constricted, throaty sound plus some difficulty with enunciation. Alto countertenor Andreas Scholl amazes all listeners by his ability to overcome such difficulties; try doing this with soprano. Also, Aris, singing with partial voice and not having the larger than normal chest of a castrato or the benefit of their training, must take more breaths, thereby interrupting some vocal lines that castrati would have sung more smoothly.
Aris stated that his 1990s recordings overcame to some degree the vocal difficulties of his earlier recordings. It's too bad we don't have Aris or others like him today to fill the gap. If high countertenors like Philipp Jaroussky or some natural sopranos have the power and agility to conquer Baroque castrato vocals, take on more of these roles, make CDs, make music DVDs. If you can not find or afford this rare recording, try interlibrary loan or your music-loving friends. You should hear it.