British Army Cavalry and Royal Horse Artillery Regiments sound a call different from the Infantry version shown below known as The Rouse but often misnamed 'Reveille', while the Scottish Regiments of the British Army sound a pipes call of the same name. Source: Wikipedia
This clip is a bit long, but well worth the time to watch. It made me cry. God bless all those that have served or are serving this great country.
Hat tip: My ♥husband♥