„String Quartet No1“ was composed by Friedl and performed by Apartmenthouse, „Inside Piano Solo“ was performed by Friedl in 1992 at Berlin‘s Hochschule der Künste, both tracks are unreleased. „Groove“, „Bieps“ and „KRRR“ are Zeitkratzer songs recorded in Cologne in 2011 and soon to be released. The unreleased „Lied Ohne Worte“ features Friedl on e-guitar with vocals by Sarah Wong.