Gnossienne No. 1
You need a MIDI keyboard and Chrome, Edge, Firefox or Opera on a desktop or laptop. Not Safari, not iPad, because Apple does not support Web MIDI. Full requirements.
The best argument in the library that sounding hard and being hard are different
6:25 of music. 755 notes. That is 2.0 notes per second, averaged, and even its busiest 25 seconds only reaches 3.9.
For scale: nothing in the library averages fewer notes per second than this. Only Satie's own Gnossienne No. 3 matches it, and only four of the 315 charts are gentler at their peak. Satie wrote it with almost nothing happening at once, and that is the whole effect.
People hear this piece and assume it is beyond them because it sounds finished and strange and adult. The arithmetic says a beginner can reach it in the first week.
The left hand plays more than the right
68 percent of the notes are in the left hand, against 32 percent in the right. That inversion is unusual, and it is the piece: a slow repeating left-hand accompaniment underneath a melody that has long silences in it.
The piano roll shows the consequence. The magenta band is regular, almost mechanical, while the cyan above it is sparse and irregular, sitting out whole stretches. Most of what you actually play is the accompaniment, and most of what a listener hears is the melody.
Why the tier is 4
Tier 4 of 5 looks wrong next to 3.9 notes per second, and it is the same lesson as Clair de Lune: the tier counts how many notes a hand holds at once, not how fast they come. The left-hand chords here are wide. They are just wide and slow, so you have all the time in the world to place them, which is why this reads as an easy piece to play and a harder one to sight-read cold.
Playing it here
Play the right hand and let Klaviero hold the accompaniment first, so you learn the melody's silences, which are the hard part of the phrasing. Then take the left hand, which is where the notes actually are.
Gnossienne No. 1 is in the free tier.