"Tempo Perdido" (Portuguese for "Wasted time") is a single by the Brazilian rock band Legião Urbana, Written by the vocalist Renato Russo, it was original released as the second promo single of the 1986 album Dois in july of the same year, is the most popular song of the band According by the Escritório Central de Arrecadação e Distribuição (ECAD),[1] the last verse of this song, "Somos tão jovens" (We're so Young), Inspired the title of Russo's biopic of the same name.

[2] In a letter sent to record label EMI with album notes, Russo said that the track was "until now unbeatable as the last track of the first side and too dense for extensive airplay.

Many believe, however, that it is the strongest track of the album and, consequently, an instant hit single.

But it is not the track to be worked at the start.

The conception originally included a final acoustic sequence that would be an impromptu (acoustic guitar, wind, campfire, waves, effects) commenting on the theme and the ideas presented by the song itself and preparing the terrain for the second part of the work, side 2.