hi, i was wondering if anyone knows has the sheet music for the piano in this movie. im talking about the song that is played a couple if times in different parts it is played over like one or two constant notes on some string instrument i dont know what. they play it in the part where it has brooks narrating the letter he wrote.even if you dont have the music if you know the name of the song please tell me i really would like to learn it. thanks a lot.

its on the soundtrack and its called compass and guns but idk how to find sheet music for it