The collection was completed in 1841, and initially composed for tenor, and mezzo-soprano, later arranged for baritone, contralto, or soprano, and piano.
en.wikipedia.org Though present in jazz and country music, there were few contralto singers in popular music at the time.
en.wikipedia.org Charlotte was a remarkably bright, sportive child, excelling over her schoolmates and developing a voice of remarkable compass and richness, with a full contralto register.
en.wikipedia.org A demanding work, it requires 14 soloists (three sopranos, one contralto, two tenors, four baritones, and four basses).
en.wikipedia.org Singers in this class, like the coloratura contraltos, are rare.
en.wikipedia.org