What is a Mezzo Soprano?
A mezzo soprano is the middle vocal range for women, comparable to the baritone range among men. The word mezzo means medium or middle in Italian, and usually refers to female singers with characteristics of both alto and soprano singers. The classic singer in this range has the ability to reach high notes, usually up to the C two octaves above middle C, while retaining a richer timbre of voice similar to that of a deeper-ranged alto.
The distinction between sopranos and mezzo sopranos became necessary during the 18th century as musical composition drew away from using mostly male voices. They were originally used to fill secondary roles, particularly those of coquettish characters called soubrettes. An ideal mezzo possesses a range of at least three octaves, and has a darker, richer voice than most sopranos.
Mezzo sopranos are further divided into three groups, based on the relative richness and range of their voices. Coloratura mezzos are generally strongest near the top of their range, and they can often sing as high as sopranos. Lyrical mezzos are the most common of the three groups and are most comfortable in the middle area of their range. Dramatic mezzos are closely related to altos, and have very deep, rich singing voices that can still reach upper registers.
Coloratura mezzos operate a unique position in most compositions. Until the 18th century, operas often included roles for countertenor castrati, men who had been castrated before puberty to retain their higher voices. After the trend fell out of fashion, coloratura mezzos and sometimes lyrical mezzos stepped in to fill these roles, as not only the range but the quality of their voices was often similar to countertenors.
If an opera specifies a trousers role, or a role traditionally played by a woman dressed as a man, the part is normally filled by a lyrical mezzo. Oberon in Benjamin Brittan’s A Midsummer Night’s Dream and Cherubino in Mozart’s The Marriage of Figaro are famous roles usually played by singers in this range. Of the few lead roles written for mezzo sopranos, most play to the lyrical mezzo’s strengths.
Large roles for these singers in opera are often limited, with heroine or lead roles rarely being written for a mezzo. Most often, they play villains, enchantresses, witches, or middle-aged women. This operatic typecasting is often frustrating to performers, some of whom are capable of singing soprano or alto roles. One of the most famous operatic heroes is a mezzo soprano, however, in Bizet’s Carmen. The role of Carmen is sought after by many aspiring mezzos as their biggest chance to prove themselves and their talent.
In choirs, performers in this range are usually called second sopranos and are used to varying degrees. If the choir is sufficiently advanced enough, pieces with six or eight part harmony will include a part for them. Otherwise, mezzos are generally divided between soprano and alto parts, able to add a darker timbre to the higher registers or broader range to the lower, as needed.
While this is a good general explanation, and the historical information is very useful, there are quite a few issues with some of the generalizations here. There are indeed many great mezzo roles in opera, although there are far fewer than there are for soprano. The last paragraph, however, is simply wrong. In choirs, mezzos are equally or perhaps more likely to sing alto rather than second soprano, and often switch-hit. The real problem with the explanation above is that while there is some good explanation of the darker timbre of a mezzo voice, the author seems to treat the classification as purely an issue of range rather than color. Many mezzos can sing as high as their soprano counterparts, as low as the low altos, and in some cases, both. In the same vein, 'Carmen' is sometimes sung by sopranos (and this fact makes many mezzos furious). But in the end, it's not about the label -- it's about the way the voice fits the role and the character as well as the music. I know this is confusing, but that is the wonder of the human voice -- each one is unique, with its own characteristics, strengths and weaknesses.
I beg to differ. There are several lead roles for a mezzo-soprano.
Check the wikipedia page on mezzo-soprano and you'll see it
If you think mezzo soprano solos and musical theatre roles are limited, consider that it is often even worse in classical music for alto singers. While popular music is full of opportunities for women with deep voices, classical, Opera, and even Broadway musical pieces rarely have many large roles for altos.
I like the italian soprano singer María Rota.
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