The anthem of Bulgaria, Mila Rodino, instrumental singalong

From nationalanthems.info:
"Originally written and composed by a Bulgarian student in 1885, as he went off to fight in the Serbo-Bulgarian war, the song was titled “Горда Стара планина” (“Gorda Stara planina”) [Proudly Rise the Balkan Peaks]. The original lyrics have undergone revisions since its original composition, the latest after the fall of the communist government in 1990 where verses not in the original lyrics speaking of friendship with Russia, the Communist Party, and fallen fighters were removed. As the national anthem its name comes from the first line of the chorus rather than the first line of the verse."

Flag animation from ProFounder
Edited on ClipChamp
Arrangement by nationalanthems.info via the Web Archive
Soundfont is SGM V2.0-1, exported via signal.vercel.app