The story behind
Soda Stereo wrote Lo que sangra (La cúpula) in 1988, as part of the album Doble vida. The song has a marked funk rhythm, with a guitar moving between riffs and a bass that acts as percussion. In the first minute, the electric guitar and timbales open the track, then drums, keyboard and bass join in. The voice of Gustavo Cerati has an echo effect, as if it were heard from afar. At the end, the song is left with acoustic guitar and timbales.
The lyrics seem to speak of a place where everything moves fast, with lights and people dressed like actors. It talks about a staircase that goes up towards something called "the dome", and dark glass that reminds one of that of a limousine. It also mentions an "emergency exit" that wasn't real, as if the place were trapped. Some believe it refers to a disco that collapsed in 1987, in San Nicolás de los Arroyos, where five people died and many were injured. The song was made in that context, as an echo of what happened.