Salomé is the name of the most famous U2 bootleg, a 3-CD set of U2’s early studio sessions for the Achtung Baby album.
In the winter of 1990, U2 were hard at work in Hansa Ton recording studios in Berlin, Germany. The ultimate result of this effort would be the November 1991 release of their next album, Achtung Baby. However, in December 1990 that album was a great ways off, because U2 (unlike most other bands) entered the studio with very few lyric or song ideas. Instead, U2 came into the studio to create as well as record. Here they sought inspirations for songs from playing together. They would etch out ideas while improvising around some basic idea, or riff. Since all this jamming was taking place in a recording studio, even the simplest of ideas was captured on tape. The highlights of these tapes were then edited down and compiled into “working tapes” recorded onto DAT (Digital Audio Tape) cassettes. Tapes of this nature were used to hold possible song ideas, as well as a means for Brian Eno (and others) to hear the band’s progress and make suggestions about the music.