Formerly known as Lemon Pie, this group was formed by singer Ledissez and keyboardist Guerin in 68, Ergo Sum released only one album in 71. This album was the first one on Laurent Thibault's new label Theleme and was recorded at the famous Herouville studios. Singing in English, Ledissez's voice was certainly an acquired taste (reminding of Family's Chapman), but the group's many other assets certainly made up for that: Meynet's violin and Guerin's flute and the frequent use of percussions graced their blending of rock and jazz, but not really being a jazz-rock group either. The group then recorded a single with a fairly different line-up and the last concerts saw François Bréant and Perru (ex-Cruciferus and future solo artist), JM Truong (pre-Zao) and Marc Bertaux. Bréant and Perru will then form Nemo (not to be confused with the 90's French symphonic group though) for one jazz-rock album.