1. Larghetto (B-flat minor)
2. Andante (E-flat major)
3. Allegretto (B major)
https://en.wikipedia.org/wiki/Nocturnes,_Op._9_(Chopin)
https://es.wikipedia.org/wiki/Nocturnos,_op._9
https://imslp.org/wiki/Nocturnes,_Op.9_(Chopin,_Fr%C3%A9d%C3%A9ric)
