Pieces with "direct action" on the piano strings

Chopin wrote:

My previous topic had two souls, but many focused on a single question, so I am proposing it again....

It seems that Bollani claims the Second Viennese School wrote pieces with direct action on the piano strings, but I didn't quite understand what is meant and I hope I reported it correctly.

What do you think?

for example Cage wrote pieces for "prepared" piano, but I don't know of any analogous ones from the Second Viennese School. It would be interesting to know if there is something...

Open content (youtube)

Bianca wrote:

It would be interesting to know if there is something...

It seems that the first one is Henry Cowell, whom I do not know... I will look into it

Chopin wrote:

It seems that Bollani claims the second Viennese school wrote pieces with direct action on the piano strings, but I didn't quite understand what is meant and I hope I reported it correctly.

Not knowing the subject, I made a bit of a muddle

For completeness, I am quoting an intervention by Thallo

thallo wrote:

Bollani DID NOT CLAIM that there are pieces from the second Viennese school with direct interventions on the strings. I remember this very well; Bollani said, correctly, that the first to conduct experiments was Henry Cowell. And then he spoke of Cage and the prepared piano. And then he alludes to an experiment by Satie...

http://www.rai.tv/dl...c378c34bd4.html at around minute 43.