3000 years ago you might be able to hear primitive humans banging on handmade drums and chanting to gods and deities. Today, radios and televisions play metal, rap, classic rock, jazz, blues, punk, pop, and the list goes on and on. There are even "music reality shows on television. Clearly, the definition of "music is something that is ever-changing and evolves as fast as the human race. Music has a different meaning to each individual person making it almost impossible to pinpoint a definition. Although it is almost impossible to define, music's different meanings can be generalized and explained as opinions rather then fact.
Now, I don't want you to think I don't know what I'm talking about so I'll go into a short history lesson on myself. I took piano lessons as a child. In middle school I started playing orchestral percussion. I played in 2 orchestras as well as spending entire summers in Michigan at music camps. In high school, I was in the marching band, jazz band, and I took some music theory classes. I also started my own jazz/funk combo group. I went to an audio engineering school in Orlando and now I'm signed to a record label as a producer and I'm working every night in my studio at my apartment. Sorry, I don't mean to come off as being egotistical I just wanted to validate my opinion on the subject.
In Merriam-Webster's dictionary music is defined as "the art of combining tones so that they are pleasing, expressive, or intelligible. Personally, I find this explanation totally ridiculous. I believe that any sound can be music if it is heard by the correct ear. An air conditioner, the rain hitting a tin roof, leaves blowing in the wind, a truck passing by, all of these things can be music. John Cage is a composer who was most famous in the 60's and 70's. He wrote a piece called "4