Over at Aquarium Drunkard, there's a download available of a 1975 concert by CAN about which they make the following remarks:
There are those among us who will shudder when I say this, but let’s face facts: Can was a jam band. Indeed, jamming was at the heart of pretty much everything the legendary krautrockers did. Rather than a group centered around a songwriter, Can was a collective of improvisers whose primary modus operandi in the studio was — not unlike Miles Davis’ and Teo Macero’s approach in the 1970s — to play freely as the tape rolled, and then, later, edit the best bits together. This mix of spontaneous interplay and after-the-fact composition is one of the keys to the success of their well-nigh unparalleled run of LPs form the late 60s to the mid 70s.