do the songs play an important role for the fil to be a hit?

Well i think songs were of much more importance earlier when there was no such a dominant media or television.There are lots of earlier films which were not having very good stories but still were huge hits because people used to rush to theatres just to watch the songs.The scenerio is not just same as yet as many great musicals have ben flop in recent years & many films which are sensible having no song or less song have become hits.

I guess yes, Film like Titanic although we all watched it except those who are not on that type of film, much more became a hi when Celine Dion sang the themesong My Heart Will Go on. I don't know if Karate Kit became a hit but I always remember it when Glory of LOve is playing. Armagedon became a hit also by the song Leaving on a Jet Plane. THe sound of music became a hit because of the song of the same title. A song adds to the life of the story. when that song is playing we remember the movie abruptly. that is why whenever there is a film, there is always a certain song for it because it adds to the life of the film. That is why they are doing a original soundtrack album for a movie.

I agree most of the movies that I have seen the music that is picked for the movie sceens and the actors seem to fit.

Yes i certainly do agree..One movie that i enjoyed so much was "Oh Brother Where Art Thou" the songs just made that movie a hit for me..I loved the music.I have looked at that movie many times just to hear the music...Another Movie I loved the Music in was "Ghost"......There are a few more but cannot remember right off ...