"Si Tú No Vuelves" (English: If You Don't Return) was first released in 1992 as the lead single for Miguel Bosé's studio albumBajo el Signo de Caín. The song was written by Bosé, Lanfranco Ferrario and Massimo Grilli. For the international edition of the album an Italian adaptation was recorded, Se Tu Non Torni, and an English lyrics one titled "They're only words" from the English language album Under the sign of Cain.
The song is a re-make of Miguel Bosé's song featuring the Colombian artist Shakira and is included on the former's album Papito. "Si Tú No Vuelves" was first released in Italy and it was recorded by Gustavo Celis in Panama. The song is slow and melodic, and gradually reaches a climax where Shakira ends the song.