FrullaPapaya

I develop acoustic echo cancellation algorithms for a living. if there is echo also when your mic is muted, that means that it is not really muted. This makes me think that probably your headphone is feeding back the headphones signal to the microphone, probably due to faulty circuits inside you headphones.

Maybe it’s a bit too much

Check out imslp.org, you will find any classical music piano sheet, in multiple version and also with audio recordings

This looks so good, I love it

Cereals in the toilet bowl was too much

That looks very nice! You should try some cheap mod like the tape mod