In 1970s Munich, West Germany, music producers Giorgio Moroder and Pete Bellotte made a decisive contribution to disco music with a string of hits for Donna Summer, which became known as the "Munich Sound". In 1975, Summer suggested the lyric "Love to Love You Baby" to Moroder and Bellotte, who turned the lyric into a full disco song. The final product, which contained a series of simulated orgasms, initially was not intended for release, but when Moroder played it in the clubs it caused a sensation and he released it. The song became an international hit, reaching the charts in many European countries and the US (No. 2). It has been described as the arrival of the expression of raw female sexual desire in pop music. A 17-minute 12-inch single was released. The 12" single became and remains a standard in discos today. In 1976 Donna Summer's version of "Could It Be Magic" brought disco further into the mainstream. In 1977 Summer, Moroder and Bellotte further released "I Feel Love", as the B-side of "Can't We Just Sit Down (And Talk It Over)", which revolutionized dance music with its mostly electronic production and was a massive worldwide success, spawning the Hi-NRG subgenre. Giorgio Moroder was described by AllMusic as "one of the principal architects of the disco sound". Another successful disco music project by Moroder at that time was Munich Machine (1976–1980).