In musIc, tIme is referred to as tempo and the tempo of the piece of written music is stated at the beginning of the chart. In most modern guitar charts the tempo is denoted numerically in ‘beats per minute’. the BPm of a piece usually refers to the number of quarter-notes, or ‘crotchets’ per minute; that recurring pulse at which you naturally tap your foot along with. A song at 60bpm would naturally be the same speed as a ticking clock and various tempi can be accessed by decreasing or increasing that number.
sometimes tempi are written more traditionally using Italian descriptions to denote the general speed of a piece. A piece around 60-76bpm would be called Adagio which means ‘slowly or at ease’, Andante is ‘walking pace’ at around 76–108bpm, and moderato literally means ‘moderately’ at 108–120bpm. At the quicker end of the scale we have Allegretto which describes a ‘moderately fast tempo of 112–120bpm and Allegro is a quicker, and more energetic 120–168bpm.
It is also possible to speed up or slow down the tempo within the piece of music. the direction Accellerando, means that you should gradually increase the speed of the piece. this is usually shown on the score in the abbreviated form //accel.// and is placed above the score with a horizontal dotted lined indicating the section to be sped up.
Ritardando is the exact opposite and