According to Björk, she e-mailed "Where Is the Line" to British musician Mark Bell, who a year later replied with a little idea for it.
[3] In an interview with Uncut, Björk revealed that she kept hearing "Bohemian Rhapsody" by Queen in her head when I was editing "Where Is the Line" and "Vökuró", another track on Medúlla.
[6] Today website was positive towards "Where Is the Line", and said that "it was no coincidence" that one of "the most exciting tracks" on the album contained more percussion and instrumentation than the others.
[8] Heather Phares of AllMusic commented that the track was one of Björk's "tough, no-nonsense songs", and "Rahzel's hard-hitting beats make it starker than anything on Homogenic".
She gives birth to a convulsing person (dancer Erna Ómarsdóttir) covered in a white stickiness[nb 1] who, after a wild dance, withdraws back inside the host.
[15] Additionally, "Where Is the Line" was performed along with musician Mike Patton, best known as the lead singer of the alternative metal band Faith No More, on the Biophilia tour on 28 May 2013, in San Francisco.
[18] A remix by Mike Patton, who contributed to the original song, was made available for download on War Child Music in April 2005.