What is the correct technical name for the music that plays in the background of a scene while the action takes place? ?

Discussion board 5 - the romantir areanocturne, op. 9 no 2 solo piano - chopin (peatured listening p 778)when you listen to this piece, what does it make you think of and how does it make you feel? what do you think "nocturne" means? is that an appropriate title for this piece? the piano uses rubato throughout - what effect does that have on the performance? do you think the use of rubato enhances the performance, or would you rather hear a steadybeat throughout the piece? after you post your answer, read and respond to the posts of at least two other classmates.