Excess of vibrato became a stylistic thing of the C20th for both voices and instruments, especially strings. Part of it is to do with making the sound carry in large auditoria where the sound is unamplified. But I think it's horrible when it's overdone e.g. old-style coloratura operatic sopranos singing Verdi (we'll draw a veil over my comment made some years ago describing the fact that I don't like wobbling sopranos....).
The original purpose of vibrato was to add colour - it was not a continuous thing. I was taught as a singer to sing 'straight' with no 'wobble'. Longer notes, especially at slower tempi, need to change/evolve/develop - they shouldn't stay the same as it become a boring flat sound.
There are various ways of colouring notes: you can change the dynamic, such as swelling through the note, or you can have a messa di voce which does <> i.e. swell and dimishishes within the duration of the note. You can 'decorate' the note by adding ornamentation (tastefully!) and you can add vibrato. Vibrato should be used sparingly to add colour and it should vary in tempo - the speed of the vibrato is rarely constant and can change, in the way that the speed of a trill can change.
Trouble is, it became fashionable to have continuous vibrato around early 1900s, and because of recording, we've become glued to it. Other then fashionable tendencies such as excessive use of portamento have fall into desuetude.
The original purpose of vibrato was to add colour - it was not a continuous thing. I was taught as a singer to sing 'straight' with no 'wobble'. Longer notes, especially at slower tempi, need to change/evolve/develop - they shouldn't stay the same as it become a boring flat sound.
There are various ways of colouring notes: you can change the dynamic, such as swelling through the note, or you can have a messa di voce which does <> i.e. swell and dimishishes within the duration of the note. You can 'decorate' the note by adding ornamentation (tastefully!) and you can add vibrato. Vibrato should be used sparingly to add colour and it should vary in tempo - the speed of the vibrato is rarely constant and can change, in the way that the speed of a trill can change.
Trouble is, it became fashionable to have continuous vibrato around early 1900s, and because of recording, we've become glued to it. Other then fashionable tendencies such as excessive use of portamento have fall into desuetude.
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