1. Sounds, usually produced by instruments or voices, that are arranged or played in order to create a pleasing or stimulating effect.
2. The art of arranging or making sounds, usually those of musical instruments or voices, in groups and patterns that create a pleasing or stimulating effect.
3. Music of a particular type, for example, of a particular place or time, for a particular instrument, of a particular style, or appealing to a particular group.
4. Written notation on paper indicating the pitch, duration, rhythm, and tone of notes to be played.
5. Any sound or group of sounds that is pleasing or stimulating.
Why is it that the beginning of time, the Big Bang, is referred to as if it were a noise? Why is it that music is universal? Think about it. The signals that SETI has sent out have contained music. Two people, neither of which understand the other's language, and who have never met before, can listen to the exact same music – and both enjoy it. This is true the world over. A group of musicians can meet for the first time and, without a word being spoken, create a wonderful piece of music. Everywhere you go these days, people are listening to music. Everybody has his or her personal tastes, too. But one thing is universal. It is all music. It all contains the same chords, the same notes, and if a note is badly out of tune, you will notice. Why? Why is this a fact? Oh, it is true that there are tone-deaf people in the world, people for whom the sound of music is just that: a sound. But for most of humanity, there is music. Indeed, it is not just humanity. Birds sing, and almost all animals make noises, make music. Why? Why does music have such a hold over the world? And what if – what if – there was a "Bang" at the beginning of the universe? What if you could hear it? What if it was… a song. Eventually someone will find this beat, this song of the universe. Until then, all we have is the music of Earth.