Tuning a steelpan is a masterwork of acoustic engineering. A tuner (called a 'pan builder') starts with a flat 55-gallon oil drum, sinks it into a concave bowl, and then carefully hammers out distinct 'notes' on the surface. What is remarkable is that each note is not just a single vibrating surface; it is carefully shaped so that the harmonics—the octave and the fifth—are also tuned within the same note area. This is done by hammering specific parts of the note's boundary to control the 'modes of vibration.' When a player strikes a note, these harmonics ring out in perfect alignment with the fundamental, giving the steelpan its rich, complex, and 'bright' sound. Because the notes are all on the same physical piece of metal, they are separated by 'grooves' or 'buffer zones' to prevent one note's vibration from bleeding into another. It is the only instrument where an entire orchestral section is made from recycled industrial containers.