Francisca Reyes-Aquino began collecting Philippine folk dances in the 1920s while studying at the University of the Philippines. She traveled to remote villages to document traditional dances before Western culture could modify them. She published her first collection of Philippine folk dances and games in 1927. The dances reflected the diversity of Philippine culture and were classified into five major groups - Cordillera dances from mountain tribes, Spanish-influenced dances, Muslim dances, tribal dances of ethnic minorities, and rural dances. Each dance type expressed aspects of associated traditions, rituals, and ways of life through music, movement, and costumes unique to different regions of the Philippines.