In its most general form, describe music as an art form or cultural activity that includes the creation of musical compositions (songs, tunes, symphonies, etc.), performance, evaluation of music, the study of music history, and the teaching of music. Ancient Greek and Indian philosophers defined music as the tones arranged horizontally as melody and vertically as harmony. Sayings such as „harmony in all fields“ and „this is music in my ears“ point to the notion that music is generally orderly and pleasant-sounding. But the 20th-century composer John Cage thought that any sound could be music, saying, for example, „No noise, just sound.“ voip phone service