Ahh! The beautiful sounds of Jazz music echo from what once was an oil barrel. The steel drum, aka steel pan, playing these beautiful notes endured a process of stretching to give its concave, dish shape, i.e. sinking the pan, which is the most physically demanding stage in the evolution; and tempering to make it stronger. The pan is heated with a fire torch until the metal glows red-hot and is immersed in cold water. Lastly, hammering to mark the placement of each note on the sunken head of the drum and  “grooved” using a nail punch and a hammer to make each note distinctive, vibrates precisely and has a perfect pitch with every tap of the sticks.