Classical Cadenza

Hi, I'm trying to play cadenzas for classical concertos. I meant, the real, improvised on the spot kind of cadenza. I wonder if anybody here have experience with it, and can point me to the right direction. I play the flute by the way, and already did a lot of jazz improvisation.

I found it difficult to do improvisation in free rhythm without any accompaniment. I can't get it organized. Furthermore, it sounds like either Baroque or romantic music most of the time (I want to use it for Mozart's Flute Concertos). Any suggestion?

Maybe it's a good idea to study Robert Levin's Cadenzas to Mozart's Violin Concertos as published by Universal Edition, UE 17 588. He gives you not only a lot of variants of cadenzas for each movement of a concerto, but also many lead-ins (Eing

Last year my daughter wrote her own cadenza for Mozart's K.219 Violin Concerto. She also wrote a lengthy dissertation on the subject, but a main goal was to apply structural principles to produce a stylistically congruous cadenza wihout necessarily being imitative. She did in fact perform the cadenza that she wrote in the context of a full performance of the work. I don't know if she actually tried improvising a cadenza but I would imagine that one would be better placed having done that research and understanding the harmonic principles, in this case Mozart's.