Lisa does a fine job of explaining most of a music sheet, but for this:
What is it's meaning?
Lisa does a fine job of explaining most of a music sheet, but for this:
What is it's meaning?
Notation for tempo.
Tempo is the speed at which a piece is played measured in number of beats per minute.
The example you presented indicates a tempo of 80BPM for that piece.
Cheers,
manXcat