a joy to watch and -- especially -- to listen to 
(ROOT (NP (NP (DT a) (NN joy)) (SBAR (VP (VP (TO to) (VP (VB watch))) (CC and) (, --) (ADVP (RB especially)) (, --) (VP (TO to) (VP (VB listen) (PP (IN to))))))))
(ROOT (NP (NP (DT ) (NN )) (SBAR (VP (VP (TO ) (VP (VB ))) (CC ) (, ) (ADVP (RB )) (, ) (VP (TO ) (VP (VB ) (PP (IN ))))))))