This is Leia’s Theme, from the Star Wars soundtrack by John Williams. It’s one of the standards of film music, from one of my favorite soundtracks of all time.
MIDI realization is trickier than simply “plug the notes into the computer and hit play,” especially for larger orchestral works. It forces you to consider so many different aspects of how orchestration, performance, acoustics, and recording engineering work together. Looking closely at this score has given me new appreciation for Williams’ work.