In Chopin’s Nocturne in E-flat Major, in the second measure, there is a symbol I have never really understood. Above the trebel staff, there is a flat sign, a sideways “S,” and a natural sign. The music is five notes played in the time of four–five 32nd notes. What is this symbol and phrase called?
It’s a Turn or Grupetto. Explained here
The flats, sharps or naturals refer to accidentals on the notes above or below the note that the ornament is executed. Also explained in the web page.
Thanx 