Many Mexican rock stars became involved in the counterculture movement. One of the most notorious bands from this decade was La Revolución de Emiliano Zapata, from Guadalajara, Mexico. After winning a local contest, they signed a contract with Polydor Records, and their single "Nasty Sex" was a #1 hit in Mexico in 1971, the only rock song from a Mexican band to achieve such a feat in that decade. However, after many members left the band and the Mexican government severely restricted the recording, publishing, and airplay of rock music in the country, the band (like many others at the time) changed its format and became a romantic ballad group.