spiked by jolts of pop music 
(ROOT (S (VP (VBN spiked) (PP (IN by) (NP (NP (NNS jolts)) (PP (IN of) (NP (NN pop) (NN music))))))))
(ROOT (S (VP (VBN ) (PP (IN ) (NP (NP (NNS )) (PP (IN ) (NP (NN ) (NN ))))))))