In music you have a time signature, which is the number of beats in a bar The time signature for most music and certainly most popular music is 4/4, theres 4 beats in each bar Listen to Stuck on a puzzle by alex turner, a very clear 4 beat repeating riff on drums Then you can have 3/4 which is 3 beats per bar, for example Sing It again by Beck But to actually count, drums/percussion is a good place to start, or try to tap your foot to the regular beat and count how many you do in a repeating rhythm to be honest it will come with practice and getting an ear for it
Understand what a measure is. Music is divided into measures, which are designated by a vertical line. Notes in music are named based on how much time they take up within a measure. Think of the measure as a pie that can be cut into quarters, halves, eighths or a combination of different notes
The School of Athens represents all the greatest mathematicians, philosophers and scientists from classical antiquity gathered together sharing their ideas and learning from each other. These figures all lived at different times, but here they are gathered together under one roof.