In one study, the researchers actually explored the creativity of improvisations played by cellists with no formal training in improvisation. At the start of the study, they measured everyone's working memory capacity. Then, participants were given the chance to perform three 3-minute improvisations based on a theme (such as Winter or Spring). Each improvisation had a different theme. The improvisations were recorded in a studio, and then professional musicians rated them for their originality and creativity. The creativity of the first improvisations people performed was about the same regardless of their working memory capacity. However, the people with high working memory capacity played better improvisations as they progressed through the study, while those with low working memory capacity played worse improvisations. So, by the end of the study, the people with higher working memory capacity were playing significantly more creative improvisations than those with low working memory capacity.