The great advantage of learning how to read music is it is a world wide universal language that is recognised by musicians across the globe. Which can be used for musicians, choirs, singers and orchestras. Though there are simpler and more basic methods for example reading guitar tab, reading music is the dominant traditional method.
It has the great advantage that once mastered it allows you to play and get quickly familiar with new pieces. Allowing you to be more flexible and greatly expanding your music knowledge.
Also even if the music is not from your country and speaks a different language, reading music is universal and has no barrier to language. Libraries often stock a large and varied catalogue of music including jazz, classical, latin, popular, dance and country genres.

It is reassuring that written music is authoritive in the sense that it will be accurately transcribed to paper so the music shown will be exactly how to play the piece concerned. It can be self taught without the aid of someone else to help you learn the music. It also allows you to return to the music and quickly remember it even if you have not played it for a while. To learn a new instrument would also be aided by learning how to read music.
A well trained musician can play even a new piece at speed by being able to read the dots.
Lee can advice on playing and selling musical instrument http://www.guitarscale.co.uk/ http://www.musicinstrument.biz/