Nocturne Op.9 No.1 is a purchasable stage in Piano Tiles 2. With 1189 Tiles per round, this is the 3rd longest song in the game. It is often considered as one of the most beautiful songs in the game.
This nocturne is the first of the three Nocturnes Op.9. It has a lot more rhythmic freedom than Nocturne Op. 9 No. 2.
Check musicianjoelin's video.