music you may not have heard before 
(ROOT (NP (NP (NN music)) (SBAR (S (NP (PRP you)) (VP (MD may) (RB not) (VP (VB have) (VP (VBN heard) (ADVP (RB before)))))))))
(ROOT (NP (NP (NN )) (SBAR (S (NP (PRP )) (VP (MD ) (RB ) (VP (VB ) (VP (VBN ) (ADVP (RB )))))))))