Instead of changing the length of a single pipe (with holes or other mechanisms) to get different frequencies there is a large collection of pipes of different lengths and a mechanism to blow air thro...Instead of changing the length of a single pipe (with holes or other mechanisms) to get different frequencies there is a large collection of pipes of different lengths and a mechanism to blow air through them. How are the modes of vibration of a string similar to the modes of vibration (fundamental and overtones) of air in a tube and how are they different? How is the length of a tube related to the fundamental frequency of vibration of air inside a tube open at only one end?