From taut strings vibrating in musical instruments to micro-electro-mechanical systems for optoelectronics, vibrations cover an extensive range of applications. At the nanoscale, the study of mechanical vibrations poses several challenges and opens up a virtually infinite playground for nanotechnologies. Exciting potential benefits of controlled vibrations in the GHz-THz frequency range include better thermal transport management, novel quantum acoustic technologies, improved optoelectronic devices, and the development of novel nanoscale sensors.