
Jathi of a tālam specifies beat count of the rhythm cycle. It specifically applies to lagu component(s) of the tālam and not necessarily to the entire tālam. The different jathis are tisra (three beats in lagu), chathusra (four), khanda (five), misra (seven) and sankeerna (nine).
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http://en.wikipedia.org/wiki/Glossary_of_Carnatic_music
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