Q:Information: - Aris Christofellis ( Greek : ; born 5 February 1960 ) is a Greek sopranist ( male soprano ) and musicologist . - A soprano is a type of classical female singing voice and has the highest vocal range of all voice types. The soprano's vocal range (using scientific pitch notation) is from approximately middle C (C) = 261Hz to "high A" (A) =880Hz in choral music, or to "soprano C" (C, two octaves above middle C) =1046Hz or higher in operatic music. In four-part chorale style harmony, the soprano takes the highest part, which usually encompasses the melody. The soprano voice type is generally divided into the coloratura, soubrette, lyric, spinto, and dramatic soprano. The lyric soprano is the most common female singing voice. - Michael Maniaci (born in 1976) is an American opera singer. Possessing a male soprano voice, Maniaci is noted for his claim to be able to sing into the upper soprano register without using falsetto, an otherwise common phonation for men who sing in high registers, such as countertenors. Although this was possible for castrati, because of the hormonal imbalance following castration, Maniaci claims that, for some unknown reason, his larynx did not develop and lengthen completely, causing his voice not to "break" in the usual manner. This physical particularity has given Maniaci the ability to sing in the soprano register without sounding like a typical countertenor or a female singer. For this reason, professional vocal pedagogists consider Maniaci's voice to be unique among countertenors, and compare his vocal quality to the castrato voice of the past. - A countertenor is a type of classical male singing voice whose vocal range is equivalent to that of the female contralto or mezzo-soprano voice types. The countertenor range is generally equivalent to a contralto range, extending from around G to D or E, although a sopranist (a specific kind of countertenor) may match the soprano's range of around C to C. Countertenors often are baritones or tenors at core, but rarely use this vocal range in performance. The countertenor voice type has a lower tessitura than the contralto or mezzo-soprano. - A sopranist (also, sopranista or male soprano) is a male singer who is able to sing in the vocal tessitura of a soprano usually through the use of falsetto vocal production. This voice type is a specific kind of countertenor. In rare cases an adult man may be able to sing in the soprano range using his normal or modal voice and not falsetto due to endocrinological reasons, like Radu Marian, or as a result of a larynx that has not completely developed as in the case of Michael Maniaci. - Radu Marian (born in 1977) is a Romanian/Moldovan male soprano or sopranist. What entity does 'aris christofellis' has the relation 'voice type' with?
A:
countertenor