Two of these semitones make up a tone. Between a undeniable herbal note and the next prevalence of this herbal note, there are 11 semi tone intervals or 5. 5 tone durations. This interval is termed an octave. Other durations have different names: a tone period one note in between is called a 2nd and a double tone period three notes in among is called a 3rd. This sample keeps with 4ths, 5ths, 6ths, 7ths and then an octave as the period between the 2 notes raises. The time signature determines the number of beats in a bar and the form of beat. A bar is just a set of consecutive notes in a piece of music. Dividing the music into bars lets you keep time by counting beats in your head or under your breath. Bar lines vertical lines mark the beginning and the top of the bar. Time signatures have a top and a bottom part: the end determines the number of beats and the base determines the variety of beat.