Music

2. vocal or instrumental sounds (or both) combined in such a way as to produce beauty of form, harmony, and expression of emotion.
4. the style of simultaneously combining a number of parts, each forming an individual melody and harmonizing with each other.
5. a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale.
8. a musical instrument in which sound is produced by the vibration of air, typically by the player blowing into the instrument.
9. Pythagorean tuning is a system of musical tuning in which the frequency ratios of all intervals are based on the ratio 3:2
10. the SI unit of frequency, equal to one cycle per second
11. a series of eight notes occupying the interval between (and including) two notes, one having twice or half the frequency of vibration of the other.
12. Intensity is measured in units of energy over the area and time. ... When talking about sound waves, the volume is the perception of loudness from the intensity of a sound wave.

1. a sequence of single notes that is musically satisfying.
3. a group of (typically three or more) notes sounded together, as a basis of harmony.
4. A percussion instrument is a musical instrument that is sounded by being struck or scraped by a beater
6. the rate at which something occurs or is repeated over a particular period of time or in a given sample.
7. the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone.