Dumbarton's Drums (Late 17th Century Scottish March) - Fife & Drum

 JG Baroque says

A while ago, my attention was brought to this melody by a listener, who was kind enough to provide me with a print from 1724 (entitled "Musick for Allan Ramsay's collection of 71 Scotch Songs"), where it is listed as "Dumbarton Drums". It is still today used as a regimental march by the Royal Scots Regiment, which also happens to be the oldest line regiment in the British army, founded in 1633. The tune carries elements from an older folk song called "I serve a worthy lassie", but this version has gotten its name from General George Douglas, 1st Earl of Dumbarton, who commanded the regiment from 1653 until his fall from grace after the Glorious Revolution in 1688. This arrangement is somewhat slower than what you usually hear, both because the soldiers marched slower in the 17th century than they do today, but also because it allows the beautiful melody to come forth. The march is probably one of the oldest regimental marches still in use in the British army.