The Puhdys reunited for a one-off concert at the Brandenburg Gate in 1991, and, received enthusiastically, decided to continue; the situation in East Germany had changed, and there were signs of both "Ostalgie" — nostalgia for the GDR — and an emergent regional identity as "Ossis". The band released the album "Wie ein Engel" (Like An Angel) the following year. While the title track (about the then-current dangers of "S-Bahn surfing," youths climbing on the roof of moving Berlin commuter trains) was a minor hit, accompanied by a low-budget music video, the album is best known for the anthem "Was bleibt" (What's Left), inspired by a book by East German writer Christa Wolf, which asked obliquely what would remain from the GDR. Sales figures showed that "Wie ein Engel" had initially sold around 24,000 copies; while this was hardly a blockbuster in Germany, as almost all the sales were in the east it was a regional top seller. Re-releases of the Puhdys catalog on compact disc in 1993 also sold respectably, and numerous compilations were released.