"Chica de Ayer" (Eng.: Yesterday Girl) is a pop song written by Antonio Vega and recorded by Spanish rock band Nacha Pop and was included on their album Un Día Cualquiera.
The title of the song was used as the name of the Spanish television series La Chica de Ayer which was based on the British detective show Life on Mars, which was similarly named after a David Bowie song.
Nacha Pop was a Spanish pop/rock group active from 1978 to 1988.
The band was formed by Antonio Vega and Nacho García Vega (guitars and vocals), Carlos Brooking (bass) and Ñete (drums). They signed with Spanish EMI subsidiary Hispavox in 1980, and their debut album was produced by Teddy Bautista. Several albums followed, including 1987's El Momento, which was produced by Carlos Narea. Their final concerts took place on October 19 and 20, 1988, after which the group disbanded.
Nacha Pop were to reunite in 2007. Antonio Vega died in Madrid on May 12, 2009 of lung cancer at age 51.