English: This is a method often used to act as a guide for playing concertina [ Anglo system]. The instruments two keyboards [ one is to the left side - other to the right-hand side] have their buttons provided with numbers to denote the notes produced, and a symbol added to indicate when bellows are to be pushed in or out. As the Anglo system concertina makes two notes per button [ one when bellows pressed in - and the other when bellows pulled out]..it is different to other free reed related instruments. In this method the numbers are written below the musical staff [ for left hand keyboard side]. And the numbers shown above the staff, are for the right-hand side of keyboard. The buttons go from 1 up to 5 in numbers according to their position [ eg: numbers 1 are the lower notes, whereas 5 is higher notes up the musical scale etc]. The example on the diagram shows the notes applied to a simple piece of musical melody.