Music is an art form and cultural activity, and its medium is sound organized by time.
Its basic elements include sound level, sound length, sound intensity and timbre. These basic elements combine with each other to form the common "formal elements" of music, such as rhythm, melody, harmony, strength, speed, mode, form and texture. The formal elements of music are the means of expression of music. Different types of music may emphasize or ignore some elements. Music is played through various musical instruments and vocal techniques, which are divided into instrumental music, vocal music (such as songs without musical instruments) and works combining singing with musical instruments.
In the most general form, music is described as an art form or cultural activity, including the creation and performance of musical works (songs, tunes, symphonies, etc.). ), music evaluation, music history research, music teaching. Ancient Greek and Indian philosophers defined music as tones arranged horizontally as melody and vertically as harmony.