That's a fair question!
Basically, you can call music any noise that is set to either a rythm as in percussions or that follows a melodic line of some sort.
Our early ancestors sitting outside the cave by the fire, after a hard day of gathering and hunting food, probably made music by tapping bones together or blowing in sea shells. While the rest of them would make conveniently placed grunts and howls.
Obviously, this was not Beethoven or Vivaldi musicality:) However, music is music!
This begs another question and that is: What is "good" music?
Altough this may seem like an impossible question to answer, there is a simple one.
Good music is any music you enjoy listening to! That's it!
Music is a deeply personal experience, the more varied your exposure to music the wider your taste in music will be. My own personal taste are very ecclectic to say the least. My personal collection includes over 5000 songs and will forever keep growing.
The music I create is computer generated and I will sometime voice over one of my poem. How good is it? I have been reviewed as an heir to the famous group Kraftwerk!
But again those that do not like the type of music would refer to it as CRAP! I am getting airplay in the USA, Europe and Canada thus far. I do sell a few CD here and there:)
As I write this I have 5 albums available and working on number 6...
Music is but one of my passion but definatly the most influential driving force behind all of my other artforms and it shows in my everyday actions.
Basically, look back at history, and you will find music as the corner stone of every society no matter how small a tribe or how big a nation. It is an unavoidable fact that music is and will always be here to take us along on the long road of life.