A cylinder is a long, thin shape where the ends are circles. Any cross-section of a cylinder at right angles to its outer surface is also a circle.
Long cylinders are also known as tubes. Pipes are also cylinders. The cylinder you see the most often is, of course, the cardboard tube at the centre of a roll of toilet paper.
Cymbals are a modern percussion instrument. They are found on every modern drum kit, and you can clearly hear them in rock and pop music made any time in the last 50 years. Cymbals are made from thin pieces of metal shaped like a flattened cone. You can either hit two cymbals together to make a noise, or you can hit them with a drumstick.
