A choir voice is a vocal range that is used in choral singing. TENOR is a male vocal range between BARITONE and ALTO, with five letters. ALTO is a female vocal range between SOPRANO and TENOR, with four letters. BASS is a male vocal range between TENOR and BARITONE, with four letters. BASSO is a male vocal range between BASS and BARITONE, with five letters. BARITONE is a male vocal range between BASS and TENOR, with eight letters. SOPRANO is a female vocal range between ALTO and mezzo-SOPRANO, with seven letters. Altos is a plural form of ALTO, with five letters. Ato is a shortened form of ALTO, with three letters. TUNER is a device used to adjust the pitch of a musical instrument, with five letters. Derspiegel is a German term for a mirror, with ten letters.