Learn about chord progression
Music is all around us! Our lives would be very different if we didn't have music. Mozart lived between 1756 and 1791. His music survived through 2 centuries, but not the language. Back then, people spoke differently. And wore different clothes. But the music Mozart composed survived.
If you already know how to play the piano, and you're interested in Composing or Improvising music, this is a good site for you. Also, if you want information about an instrument (like fingerings or when it originated), this is a good site for you too.