Aho's Concerto for Theremin and Chamber Orchestra "Eight Seasons" (2011), written for Carolina Eyck. Edgard Varèse completed the composition ‘’Equatorial’’ for two Theremin Cellos and percussion in 1934. His work was a stated influence throughout the career of Frank Zappa, who also composed for theremin. Maverick composer Percy Grainger chose to use ensembles of four or six theremins (in preference to a string quartet) for his two earliest experimental Free Music compositions (1935–37) because of the instrument's complete 'gliding' freedom of pitch. Musician Jean-Michel Jarre used the instrument in his concerts Oxygen In Moscow and Space of Freedom in Gdańsk, providing also a short history of Léon Theremin's life. The five-piece Spaghetti Western Orchestra use a Theremin as a replacement for Edda Dell'Orso's vocals in their interpretation of Ennio Morricone's "Once Upon a Time in the West". Other notable contemporary Theremin players include Pamelia Kurstin, Peter Theremin, Natasha Theremin, Katica Illényi. and Lydia Kavina, Dutch classical musician Thorwald Jørgensen has been described as "one of the most important exponents of classical music on the theremin". In 2019 a group of 289 theremin players (Matryomin ensemble) (including daughter, granddaughter and great-grandson Lev Theremin - Natasha Theremin, Masha Theremin and Peter Theremin) in Kobu, Japan, achieved a Guinness world record as the largest theremin ensemble. The name Matryomin is a portmanteau of the words matryoshka and theremin.. The theremin concerto "Dancefloor With Pulsing" by the French composer Regis Campo was written for Carolina Eyck and premiered with the Brussels Philharmonic in 2018. Popular music Theremins and theremin-like sounds started to be incorporated into popular music from the end of the 1940s (with a series of Samuel Hoffman/Harry Revel collaborations) and has continued, with various degrees of popularity, to the present. Lothar and the Hand People were the first rock band known to perform live with a theremin in November 1965. In fact, Lothar was the name they gave to their Moog theremin. The Beach Boys' 1966 single "Good Vibrations"—though it does not technically contain a theremin—is the most frequently cited example of the instrument in pop music. The song actually features a similar-sounding instrument invented by Paul Tanner called an Electro-Theremin. Upon release, the single prompted an unexpected revival in theremins and increased the awareness of analog synthesizers. In response to requests by the band, Moog Music began producing their own brand of ribbon-controlled instruments which would mimic the sound of a