The superb male group, Chanticleer, varies the names applied to its vocalists, depending upon the musical range they must sing in the piece being performed, e. g.:
In Matins for the Virgin ...., Fritzsche, McKnight and White perform as sopranos (no, they are neither children nor castratos), Fitch, Lichtenauer and Wilder as altos, Baum Krol and Munderloh as tenors, Alatorre, Albinder and Runyon as baritone and bass.
In Mexican Baroque, `Fitch is countertenor, Fritzsche, McKnight, others are contratenors, with the others singing in the ranges of tenor, baritone, base baritone and bass.

In early polyphonic pieces, The Tallis Scholars characterize some of its sopranos as treble, and mean.

All this means is that these gifted choristers have extended ranges.