I can hear your voice, and I know your story
Because of J's powers, he hears specific songs coming from people - essentially, the music of their life/soul. If you have a song you want J to hear for your character - if they have a theme, or if there's a song you think fits them particularly well - let me know below!
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When he's in close proximity to Riza Hawkeye, their songs tend to harmonize and turn into something of a mash up of their themes. His individual song also tends to sound more clear and correct in her presence.
Until he's rescued his main song will likely be warped in a way that makes it sound less serious and soulful than it is meant to be.
Edit And a last minute suggestion I liked. The Phoenix by Fall Out Boy.