London jazz festival 2012: from Herbie Hancock and Esperanza Spalding to John Paul Jones – what to see

The London jazz festival starts on Friday 9 November, and here are our critics' picks of what to see – plus suggestions from performers including Robert Glasper and Gwyneth HerbertGuy Barker's Jazz Voices: Celebrating a Century of SongBarbican, Friday 9 NovemberFor the past five years, trumpeter, arranger and composer Guy Barker has opened the London Jazz Festival with this massively ambitious project, in which numerous vocalists are backed by a 41-piece orchestra: half jazz big band, half str...

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