And, suddenly, "Mantra" comes to mind, which was a song for a... wait for it... documentary film... which featured... wait again... Trent on piano.
Oh, snap! And that's also a vocal composition, credited to his given name; guess I forgot about it. Haha! This one is nowhere near as rockin' (more like a ballad-y version of 'We Fade Away' by HTDA) but I liked it. Come at me billpulsipher