The first experiments in acoustics are often attributed to Pythagoras, a Greek philosopher and mathematician who lived in the 6th century BC.

While he didn't conduct experiments in the modern sense, he was the first to systematically study the relationships between musical intervals and the lengths of vibrating strings. This discovery laid the foundation for the scientific study of sound and its properties.

It's important to note that other ancient civilizations, like the Egyptians and Babylonians, also had knowledge of sound and its properties, but Pythagoras's work marked a significant step forward in the scientific understanding of acoustics.