It is a myth that vibrato was never used in the Baroque period. It is true, however, that writers from the time describe vibrato being used on certain notes as a decoration, rather than continuously.
In this clip, Nick looks at some points in the movement where vibrato can be used to good effect.
In her book, Baroque String Playing for ingenious learners, Judy Tarling provides some helpful pointers on when historically informed players should and shouldn't use vibrato:
Vibrato should not be used at the following points:
Up-beats of any sort
Short quick notes
Continuous passages of quick notes
Resolutions of dissonances where the resolution is shorter and weaker (e.g. passing cadences)
Any passing notes, or notes on weak beats where the harmony is unexceptional
Long notes in accompanying passages, except where the harmony becomes important by way of a dissonance
Shorter accompanying figures in quavers
The last note in a slur, except as a special effect.
Vibrato should be used at the following points:
Any messa di voce (crescendo - diminuendo on a long note), particularly final long notes (in the middle)
To emphasise strong harmonic points
Long notes, suspensions or tied notes which lead to dissonance (at the end).
At the beginning of long notes marked sf or fp
On shorter notes with marked separation marked sf or fp.
1 - Understanding Sarabandes
2 - Phrasing and articulation
3 - Ornamentation
3 - Vibrato
3 - Syncopation and Playfulness in the Allegro
3 - Bowing in the Allegro
What is historically informed performance practice?
An introduction to historically informed performance practice of baroque music, and a look at period instruments and bows.
Allemande from JS Bach's Suite no. 1 in G for unaccompanied cello, BWV 1007
Ruth Alford explores this movement in the light of other baroque music for 'cello.
Giga from J S Bach's Partita no. 2 in D minor for solo violin, BWV 1004
Helen Kruger looks at what what baroque theorists had to say about bowing, phrasing and articulation and applies it to this movement.
Largo and Allegro from G P Telemann's Viola Concerto in G, TWV51:G9
Nicholas Logie discusses phrasing, ornamentation and vibrato.