Task: Question Answering
Input (English): Passage: Singers and bands of various genres have covered the song in their own style. Scottish band Marmaduke Duke performed a cover version in April 2009 on BBC Radio 1's Live Lounge show. In October 2009, it was released on Radio 1's Live Lounge – Volume 4, a compilation of Live Lounge recordings. Australian singer Stan Walker sang a jazzier version of the song on the seventh series of Australian Idol in October 2009. The same year, elementary school group PS22 chorus covered "Single Ladies" and "Halo" (2009) during Billboard's annual Women In Music luncheon held at The Pierre in New York City. In her short-lived Broadway revue "All About Me" in March 2010, Dame Edna Everage performed a version of the song with backup dancers Gregory Butler and Jon-Paul Mateo. It was also covered by Jeff Tweedy and British singer-songwriter Alan Pownall. According to Simon Vozick-Levinson of Entertainment Weekly, Tweedy sang only a few bars; he gave "Single Ladies" an acoustic feel and recited the rest of the song's lyrics. He performed the hand movements that Beyoncé and her dancers do in the song's video. Pomplamoose, an American indie music duo consisting of Jack Conte and Nataly Dawn, recorded a cover of "Single Ladies" on video, which makes use of split screens to show Dawn on vocals and Conte playing the instruments. Inspired by the avant-garde Dogme 95 movement in cinema, Conte began to record songs on video as a quick way to create "organic and raw" music. They chose "Single Ladies" as they believed that it would help them grow their audience. 
Question: What song did Marmaduke Duke performed a cover version in April 2009 ?
Output (English): "Single Ladies".