John Williams in rehearsal

John Williams in rehearsal for Concerto de Toronto- Leo Brouwer.

For those who haven't experienced it, this video may give you some idea of just how hard it is to perform concerto material with orchestra. Not that Williams makes it look difficult, far from it in fact. As usual, he makes it look like a stroll in the park!

Notice that their discussion is not at all about getting the notes - but rather about cues and dynamics.

I haven't looked at the score for this piece, but these excerpts are good examples of very difficult modern guitar repertoire. Notice Williams running snippets backstage with Brouwer, sitting cross legged, with the instrument on the "wrong" leg, talking, and still the notes are pouring out with that trademark Williams authority and tone.