Frederic Chopin: Nocturne Op. 9 (No. 2)
It is hard for one to relate the name of the song with the actual melody of it. However, it is a well known song, not only between pianists but also to ordinary people. Notable appearances of the song are on 8 1/2 by Fellini, Blue Lagon, Saturday Night Fever and one of the latest is on Dexter (season 2, episode 7). Furter information could be found by clicking here.