with synthesizers that she later imitated with her voice. It was also the first song that Rahzel sang, doing the beat in one take. Björk said that after he recorded, "we just all fell on the floor, we couldn't believe it. There's no overdubs, no treatment – this is it. I felt quite proud – if you're gonna have a human beatboxer, at least get the real thing". Composition "Who Is It" features contributions by throat-singer Tanya Tagaq and beatboxer Rahzel. Some lyrics of "Who Is It"—"Who is it that never lets you down?"—may be understood to reflect a "mother's unconditional love" in a dialogue between mother and child. The echo effects in "Who Is It" may additionally reflect the "scattered sense of self the mother may experience as she carries the burden of constant care for her child". Ethan Brown from New York magazine considered the line "Who is it that gave you back your crown?" as a kind of feminist self-validation. According to The Village Voices Laura Sinagra, the "child-welcoming" song "nods to "world music" warmth with its throat-sung yelps". Pitchfork's Dominique Leone said "Who Is It" reminded him of "Alarm Call" from Homogenic (1997), in the way it "applies Björk's idiosyncratic performances to a traditionally pleasant sounding template", though he felt 'Who Is It' featured a "much more interesting" chord progression during the verses, and an "altogether incredible rhythm track". John Mulvey from Yahoo! Launch noted that the song recalled the "kind of strident hook that Björk favoured during her commercial heyday of the mid-'90s". Critical reception "Who Is It" received positive reviews from music critics. Michael Paoletta from Billboard magazine called the song "exuberant", whilst John Mulvey from Yahoo! Launch found it "euphoric". Melanie Haupt commented that Björk's "trills in her native Icelandic work well on "Who Is It," which underscores this disc's experiment in taking the raw power of the human voice". Time Outs John Lewis stated that "Who Is It" has a melody that Cathy Dennis would kill to write. Spence D. of IGN Music said that despite the "strangely haunting" intro, the song was the most "straight forward, accessible number" on the album. Jennifer Vineyard from MTV News shared a similar sentiment, stating that despite its "cumbersome title", it was the "most immediate and catchy number, with a pure sense of seize-the-day joy: If there is to be a single released from the