I listen to classical music while I study. I've noticed a couple songs that have a kind of springing, trampoline-like sound in them. What is that? Is it an artifact of a specific play style or some kind of percussive element?
Examples with Spotify Links:
To me it sounds like the sustain pedal of the piano being pressed (the sounds usually appears at the beginning of a new chord). If that is the case, it is strangely loud. Because it is in recordings from both artists, its either an intentional choice to keep them (maybe even amplify them?) or maybe both recorded in the same studio with the same old piano.
On another note, and I might be wrong here / or overly pedantic, but these are often preferred to be called pieces (not songs). Also these are borderline classical music, maybe modern minimalism, but they follow rather the structure of pop compositions (chord progressions and repetition). Happy if anybody wants to correct me on this.
