A semi tone is the interval between one note and an adjacent note black or white on each side. Two of those semitones make up a tone. Between a definite herbal note and a better prevalence of this natural note, there are 11 semi tone durations or 5. 5 tone intervals. This interval is termed an octave. Other intervals have different names: a tone interval one note in between is termed a 2nd and a double tone interval three notes in between is named a 3rd. This sample continues with 4ths, 5ths, 6ths, 7ths after which an octave as the period among the 2 notes raises. The time signature determines the number of beats in a bar and the sort of beat. A bar is just a set of consecutive notes in a chunk of music. Dividing the music into bars helps you to keep time by counting beats in your head or under your breath. Bar lines vertical lines mark the start and the end of the bar.