Intervals.......
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 If you play a note, and then play a higher or lower note, the distance between them is called an interval. It is a 'melodic' interval if the two notes are played one after the other, or a 'harmonic' interval if they are played together. The size of an interval is measured by the number of degrees of a scale it includes,  it is always numbered from the bottom note and that note is considered number one. 
 

RECOGNISING INTERVALS !!! 

 
 

2nds, 3rds, 6ths and 7ths are called major intervals 
4ths, 5ths and 8ves are called perfect intervals 
 

MORE ABOUT INTERVALS : 
*  When a major interval is made a semitone larger, it becomes augmented. 
  When a major interval is made a semitone smaller, it becomes minor. 
  
 * When a minor interval is made a semitone larger, it becomes major. 
  When a minor interval is made a semitone smaller,it becomes diminished. 

* When a perfect interval is made a semitone larger, it becomes augmented 
 When a perfect interval is made a semitone smaller ,it becomes diminished