who was the first to introduce music ?

Answer 1

Into movies? 1928 "The Jazz Singer" was the first talkie and it featured music.

Before that movie theaters would have an organist or a piano player performing an accompaning score (fortunately most movies were under an hour). I am not sure who came up with the idea, but it worked.

Answer 2

Nature introduced music first, by different methods u can say chirping of bird is a lovely music in itself, water falling from mountains gives a sweet music to ears.......................

Answer 3

Prior to "The Jazz Singer" there were shorts and features, like "Don Juan", with synchronized music and effects track.
For more information, look here, for example:
http://en.wikipedia.org/wiki/Sound_film