EXAMPLE1 ROCK WITH VIBRATO

I’ve showcased as many types of vibrato here, from gradually introduced into the first note, to slow and shallow crossing bars 2 to 3, then becoming gradually more wide, fast and aggressive as we move towards bar 8. Adding vibrato to a string band requires a bend to pitch (eg 7th fret to virtual 9th fret) then drop down then back up. The speed and degree of drop down depends on the context.