Did you know that composers such as Beethoven and Mozart imagine the whole orchestra, how each musical instrument sounded and write the notes on the music sheet? When something is amiss, they throw the paper away and make a new one. Time travel to now, we have the computers to help us, not only to save for easy edit, but the computer itself can act as the instruments. Classical may not be your type but it does not matter. You can create your own modern composition with the band in a box, then maybe sell to an existing band or form your own.