Mars Audiac Quintet is the third album by the band Stereolab, released in August 1994. Initial releases of the CD came with bonus two-track disk, the double vinyl album came with a 7". During the recording of the album, guitarist Sean O'Hagan left as a full-time member to form his own group, while keyboardist Katharine Gifford was added.
Sean O'Hagan switched to playing drums after he left Sterolab
The statement only says he left to form his own group not anything about changing instruments. I think it was hard for the algorithm because I used specific names and instruments