 Tensions soon became apparent, and while Waters and Gilmour initially worked together, playing the video game Donkey Kong in their spare time, the two eventually chose to work separately. Co-engineer Andy Jackson worked with Waters on the vocals, and Guthrie worked with Gilmour on the guitars. They would occasionally meet to discuss the work that had been completed and while this method was not in itself unusual, Gilmour began to feel strained, sometimes barely maintaining his composure. Kamen too felt pressured; Waters had never been a confident vocalist and on one occasion, after repeated studio takes, Waters noticed him writing on a notepad. Losing his temper, he demanded to know what Kamen was doing, only to find that the pianist had been writing "I Must Not Fuck Sheep" repeatedly.
