The Phi Fa ritual is a practice preferably celebrated for a person who recovers after convalescence from a serious disease.
It is creates a sacred atmosphere accompanying ritual prayers and devotions and encourages dancing around the sacrificial altar.
The khaen is accompanied by the phin, a guitar-like stringed instrument, by a drum, and by ching, small bells, cymbals.
They believe Phi Fa will participate the ceremony and they expect healing and protection from unfavorable fortune.
These must be called back and bound to the body to ensure a person is properly protected before any important undertaking.
Musically it derived from Lam Tang Yao; however, it was performed not by trained musicians but by those, most commonly old women, who were thought themselves to have been cured by the ritual.