Weather Report's breakout album was 1974's "Mysterious Traveller", which also featured the debut of new drummer Ishmail Wilburn. The album continued "Sweetnighter"'s process of reducing the free-jazz elements of previous albums, but also showed a more fully developed compositional technique. Zawinul exploited improvements in synthesizer technology on the recording and began to add processed sound effects (such as cheering crowds, childlike cries and noises reminiscent of science-fiction aliens). "Mysterious Traveller" was the second Weather Report album to win Album of the Year at "DownBeat" magazine.