Based on the live versions of their "Liederbuch" tour, which took the Welttraumforscher from Milano to London or Vienna during the last two years, they developed completely new versions of songs such as "Der Traum der Welt", "This Could Be The Greatest Love in Town" or "Alpha Beta Centauri" in the summer of 2023. These special tracks as well as two unreleased songs can be found on their new cassette, which with the title "1981" refers to the founding year of the Welttraumforscher. After 19 years (2004 saw the release of the C-30 "Café Kosmos", the last cassette with new material), they have once again returned to their original medium with their 49th regular release - Cassetto ergo sum!