In 1977, a recording of "Liu Shui" (Flowing Water, as performed by Guan Pinghu, one of the best qin players of the 20th century) was chosen to be included in the Voyager Golden Record, a gold-plated LP recording containing music from around the world, which was sent into outer space by NASA on the Voyager 1 and Voyager 2 spacecrafts. It is the longest music track included on the disc. In 2003, guqin music was proclaimed one of the Masterpieces of the Oral and Heritage of Humanity by UNESCO.