Music theory is a language that is used by all Western instruments. Whether you play the kazoo of the krumhorn, voice or vibraphone, French horn or nose flute, trombone or triangle, Sousaphone or Saxophone… You get the idea. Whatever instrument you play, reading music will be a useful tool in your studies, and musicpurana will teach it to you. The Staff
Music is written on a staff (plural staves) which is five horizontal parallel lines. The five lines create four spaces between them.
Blank staff: 
Lines and spaces are numbered from bottom to top. Staff with lines and space numbered. 
Note : When things are counted in music – staff lines, degrees of a scale, intervals, even the strings of a guitar (don’t worry if you have no idea what some of these things are) - they’re always counted from the bottom up. Bar Lines and Double Bar Lines
To make music easier to read, the staff is divided into sections by vertical lines called bar lines. There are two types of bar lines. The single bar line is a single thin line from the top line to the bottom line. Bar lines simply divide up the staff into small sections which are easier to read. Think of bar lines as punctuation: you don’t hear them, they’re there to help with the reading.
Measure
The area between two bar lines is called a measure, or a bar. To avoid confusion, from here on, We’ll call them measures. The staff below is divided into four measures. Because some measures may have more notes in them than others, the space between bar lines doesn’t have to be equal (notice the first measure is a bit longer).
Staff with bar lines, double bar, and measure marked. 
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