The arrangement of letters is unidirectional in all languages. It may be left to right in English, right to left in Urdu, top to bottom in Japanese and so on. But the structure of music has a forward and backward reading i.e. the notes in a raga is arranged forwards and backwards. The forward or upward movement is called arohanam. The backward or downward movement is called avarohanam. It is very important to remember that every raga has a distinct and defined upward movement and distinct and defined downward movement. Some ragas may descend with the same notes as seen in the upward movement. But this is not necessary in all cases. Hence, it is very important to remember that the definition of a particular raga consists of the way the notes are arranged in both upward and downward direction The six angas in talas namely laghu, dhrtam anudhrtam, guru, plutam and kakapadam. The anga laghu has 5 jatis namely tisra, chturasra, khanda, misra and sankirna. The finger count changes according to the jatis. The seven principal talas give rise to the 35 varieties on account of the pancha bhaedas of laghu. There are 5 sthayis namely anumandra sthayi, mandra sthayi, Madhya sthayi, tara sthayi and ati tara sthayi.