Singing stones were crystals that were part of a small fountain. This fountain was used by Jedi Grand Master Yoda for meditation and reflection. As water flowed over them, the stones made gentle sounds. Jedi Master Obi-Wan Kenobi found the stones' music to be very calming. However, the soothing effect of the singing stone fountain was lessened for Kenobi due to his worries about his fellow Master and friend, Quinlan Vos, after Vos went missing during a mission in 19 BBY.
These crystals, known as singing stones, produced gentle sounds when water passed over them. They comprised a small fountain that the Jedi Order's Grand Master Yoda kept in his quarters at the Jedi Temple on Coruscant, the Core Worlds capital planet of the Galactic Republic. Jedi Master Obi-Wan Kenobi typically found the music coming from this fountain to be very calming, describing it as similar to the sounds of a chime mixed with a stringed instrument.
According to the mythology of the Twi'lek people, the singing stones of Ryloth, located in the Outer Rim and the homeworld of the Twi'leks, were attuned to the galaxy's vibrations and possessed mystical navigational powers; the Twi'leks considered the stones sacred. One such stone was named Hayananeya, and it was blue and spherical in shape.
In 19 BBY, Kenobi was summoned to Yoda's quarters and found the Grand Master sitting by the singing stone fountain, as he often did. However, Yoda was observing the fountain's flow through the Force instead of meditating. Kenobi felt concern for the safety of his fellow Jedi Master and friend, Quinlan Vos, who had recently stopped communicating during his mission to assassinate the Sith Lord Dooku and bring an end to the Clone Wars. The combined effect of the stones and the soothing aroma of special oils heated over small flames in Yoda's room was not enough to ease Kenobi's worry.
Throughout Ryloth's tumultuous history of invasions and occupations, including the recent occupation by Dooku's Separatists during the Clone Wars, and later by the Galactic Empire after the Sith overthrew the Republic's democracy, the planet's sacred singing stones were lost to the Twi'lek people. In 34 ABY, the Twi'lek musician Gaya performed the song "Hayananeya," which was named after the sacred stone, aboard the Halcyon starcruiser. The song conveyed Gaya's feeling of hearing Hayananeya's song and her plea for the stone's return to Ryloth.
Singing stones made an appearance in the 2015 novel Dark Disciple, written by Christie Golden. The novel is an adaptation of an unfinished eight-episode story arc for the Star Wars: The Clone Wars television series, which was penned by Katie Lucas, Matt Michnovetz, and Dave Filoni.
Subsequently, in 2016, the stone was added to the Star Wars Legends continuity as the Singing Stone through Update 4.1 of the 2011 massively multiplayer online role-playing game Star Wars: The Old Republic, released by BioWare. It was depicted as a maroon gemstone.