QUOTE(Claudia's Mum @ Jan 25 2012, 08:35 AM)
Just wanted to ask a few questions about cadenzas and those by Haydn in particular. If they are notated in the music would they have been composed by Haydn or added by the publisher or someone else?
Looking on Youtube I've noticed that people playing the same pieces play different cadenzas. Is this because they have written their own (some are much simpler) or are using a different edition which contains different cadenzas?
And is it always expected that they are included or are cadenzas optional especially if there a several in one piece if you have time constraints?
Cadenzas are sometimes written by the composer , and sometimes left to the performers imagination. It is an opportunity to 'show off' a bit.
Sometimes a later composer will write a cadenza for an earlier composers work. Indeed there may have been several written for any given work.
In a performance a marked cadenza, (whether by the composer, or otherwise) should be played, it does enhance the performance, if theres not one printed, improvise, and usually end with a ubiquitous trill to lead into the tutti.
More here :- http://en.wikipedia.org/wiki/Cadenza