I need to create a cadenza (a virtuoso passage inserted near the end of a concerto movement) for cello for the first part of Boccherini Concerto No 3 in G Maj (Allegro, starting at measure 98 in my score). It must be different from the cadenzas given in the editions.
I'm a little bit dumbstruck about how to start that task.
Is there kind of a standard procedure to do so? How do you start that sort of thing? Do you know of a tutorial for creating such virtuoso passages?
Any help to overcome my inhibition would be greatly appreciated.