Some predictions about the future of music:
In the not-so-far-away future, anyone will be able to compose symphonies, concertos, string quartets, etc., with the quality of a Mozart piece. It will not be thought of as a special talent. Although computer software will not be required for this to happen, computer software will exist with the ability to aid the composer in this task, even doing the bulk of the work for them if they so desire.
With this software, a user will be able to let the computer do as much or as little of the work as he pleases. He will be able to input a melody and have the program orchestrate and flesh it out into a complete piece. He will be able to choose among the styles of various classical composers, combine styles, or create his own style. He will be able to choose the piece’s length and instrumentation.
There will be a “Compose Mozart Symphony” button.
Users will be able to compose musical pieces that go on forever, guiding them in realtime, instructing them to crescendo or switch themes or change keys whenever they wish; automated composing will have the ability to be truly interactive.
This will probably happen in your lifetime, in the next couple of decades… be prepared!