In music and music theory, the beat is the basic unit of time, the pulse (regularly repeating event), of the mensural level (or beat level). The beat is often defined as the rhythm listeners would tap their toes to when listening to a piece of music, or the numbers a musician counts while performing, though in practice this may be technically incorrect (often the first multiple level). In popular use, beat can refer to a variety of related concepts including: tempo, meter, specific rhythms, and groove.

Beats Music was a subscription-based online music streaming service owned by the Beats Electronics division of Apple, Inc. First developed in 2012 under the name "Daisy", the service combined algorithm-based personalization with expert music suggestions from a variety of sources. The service built upon Beats' existing consumer electronics line, and its 2012 acquisition of the similar service MOG. The service was launched in the United States on January 21, 2014.