Japanese violinist elegantly bowing in Oxford street

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How to bounce the bow to get the right bouncy sounds ! It's all here, with the usual smile.
(That's bow to rhyme with toe, not bow to rhyme with bough or Slough ).
A Frenchman might reply "Bof !" (to rhyme with cough). But seriously, she's good.
The bouncing becomes more obvious just after 1 minute.