Bar / Measure 'distance in time', between one bar line and the next (Americans call a bar a Measure).
The lines are the vertical strokes showing where the first pulse occurs in the new bar.
Bar Lines / Measure Lines Bar lines divide music in bars. Each bar has the number of beats indicated by the Time Signature. The first beat after the Bar-Line is usually the strongest beat in the Bar. (see double bar line)
Common Time Four beats per measure or bar
Metronome a measured pendulum giving the figure for any speed wanted.
Rest / Rests Rests last for the same number of beats as the notes which they replace. A rest in a bar or measure is a period of time where no note is played.
Rhythm all tunes have rhythm. Sometimes the rhythm is free flowing, but more often it is measured with a regularly occuring Pulse. The pulse is not like the ticking of a clock: there is a physical tension and relaxation in it. Unfortunately, we often lose this effortless continuity when learning to 'keep time' in music. In the early stages of keeping time, a measured rhythm can be Counted where each syllable is given a rhythmical pattern of long notes and short notes.
