Erica Buettner is also part of The Resident Cards, a joint project with Dana Boulé with collaborating musician Boris Gronemberger that will release a new album in 2012. She also sings with Liam Carey (Secondstar), The Sobs, My Broken Frame, V.O. and has played with Françoiz Breut. In 2011, Erica Buettner participated also in Pierre Faa's song "Kokoro Iyasu" in benefit of the victims of the earthquake in the Tohoku-Kanto region, East Japan.