Don't know about the violin, but the piano part is fiercely difficult. Colaratura in the sense that staffs are "colored" with many notes.

Colaratura:

• The ornamentation of music written for the voice with florid passages, especially trills and runs.
• Vocal music characterized by florid ornamental passages.
• A singer, especially a soprano, specializing in such ornamentation.

It's especially familiar because it was used as a program theme song for KKHI, a classical station which I heard in the bay area and up and down the west coast for years, and eventually became "The Game" station with A's baseball and which later ultra-scooped Warriors games on the radio for their championship years.

Amazing history.

https://steampoweredradio.com/kkhi.html

Article is a bit techie, but you can see how fragile classical radio stations are. The other bay are classical station was bought in a big package and dumped. It went public, with programming by KUSC, in SoCal.

Except in the auto, I use radio stations in their internet incarnations via browser or app.

A former neighbor played the cello, but moved before I could propose the Dvorak concerto, for which I have a piano reduction of the orchestra part and was planning to bust my ass trying to play. They moved to North Carolina, in time for the previous and this years' disasters. Only heard from them once after "the big one". I'll try again.

I'll pass on the Franck sonata. For extremely talented people. I recall Christopher O'Riley sweating over how hard it was to rehearse in the time between weekly From The Top shows. And he's a pro.