Or, if you want real classical music 😉 :
Prelude to the Afternoon of a Faun - Debussy
Most pieces by Erik Satie (especially his gymnopedies) or Maurice Ravel (especially his two famous pavanes)
Beethoven 7, Mvt. 2
Beethoven 5, Mvt. 2
The aria from the Goldberg variations (mvt. 1/final mvt.) - J.S. Bach
St. Matthews Passion, opening chorale - Bach
Mahler 5, Mvt. 3
Mahler 6, Andante (there is argument whether it's mvt. 2/3)
Mahler 9, Mvt. 1
That's a very short list of my faves.