First used by Ottoman military "mehter" bands to frighten and demoralise the enemy, cymbals were a useful tool for an empire on the warpath. Today, Istanbul remains the centre of excellence for cymbals, where a handful of brands still produce hand-hammered bronze using techniques developed more than 400 years ago. For drummer Derin Bayhan, he would only ever use Istanbul-made cymbals because they're "100 percent handmade" and each one has a unique sound. "Even if you bought two from the same series, the same weight and structure, the two cymbals wouldn't perfectly match. "Mass production started when Zildjian went to the USA whereas the ones that stayed in Istanbul were handcrafted and still are.