The classic songs known as the "Great American Songbook" were mostly written between

1900 - 1950 by composers such as Irving Berlin, George and Ira Gershwin, Cole Porter, Harold Arlen and soooo many more.
These songs can be heard everywhere: in the movies, in commercials, on TV shows, in musicals, etc. They have been recorded countless  times and continue to be performed today by old and young performers in all genres  -

from Ella Fitzgerald to Lady Gaga to Michael Bublé to Willie Nelson.