Heroes Tonight by Janji, Johnning
I think it is someone who died, “walking alone”. That’s why it says ‘flying’ not meaning on a plane, the obvious option. The overall meaning of the sound being a dead person, who as becoming a ghost, ‘flies’ around the world, and says heroes, as in teachers, doctors, and any normal pedestrian helping others in need. This song is an inspiration, and a shout out to everyone who is a true hero.