I did some googling and I believe I know who the music composer on OUAT is!
His name is Mark Isham,
this is his website. He was also the composer for Jennifer's movie
Warrior.
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"Hook is the first person who hasn't let her down. He's always been good to her and shown up for her. That's been her biggest issue with how many times she's been abandoned and left behind, and Hook shows up for her." ~ Jennifer Morrison