Electroacoustic music originated in Western art music around the middle of the 20th century, following the incorporation of electric sound production into compositional practice. The initial developments in electroacoustic music composition to fixed media during the 20th century are associated with the activities of the Groupe de Recherches Musicales at the ORTF in Paris, the home of musique concrete, the Nordwestdeutscher Rundfunk (NWDR) studio in Cologne, where the focus was on the composition of elektronische Musik, and the Columbia-Princeton Electronic Music Center in New York, where tape music, electronic music, and computer music were all explored. Practical electronic music instruments began to appear in the early 1900s, and "electronic sounds" were also produced using animation techniques by such artists as Norman McLaren.