Madlib's first release under the guise of Quasimoto, titled The Unseen, was in 2000. The album was met with critical acclaim and named by Spin Magazine as one of the top albums of the year. Madlib (as Quasimoto) was also named as Hip Hop Connection's Newcomer of the Year, in its annual readers poll for 2000.
The distinctive high-pitched voice of Lord Quas is attained by playing the original beat at a slow speed, recording the vocals over that slow speed, then speeding the vocals along with the original beat back up to its original tempo.
(Source wikipedia.org)