in a joyous communal festival of rhythm 
(ROOT (PP (IN in) (NP (NP (DT a) (JJ joyous) (JJ communal) (NN festival)) (PP (IN of) (NP (NN rhythm))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJ ) (JJ ) (NN )) (PP (IN ) (NP (NN ))))))