(
pictured) and compared to her works by music critics. "Ego" is 3 minutes and 18 seconds long. Halsey co-wrote the song with Gregory Aldae Hein and
Greg Kurstin, while the latter, Wyatt Bernard,
Michael Uzowuru, and Austin Corona handled its production. They played various instruments, accompanied by
Alex G on guitar and Dylan Wiggins on drums. The song was
engineered by Kurstin, Matt Tuggle, and Julian Burg; they were accompanied by Kieran Beardmore and Matt Wolach as assistant engineers. Caleb Laven served as the vocal producer, Sean Matsukawa as the recording engineer,
Randy Merrill as the
mastering engineer, and
Spike Stent as the
mixing engineer. Music critics labeled "Ego" as an
alternative rock,
grunge,
pop-punk, and
pop rock track, inspired by 1990s music. Containing powerful drums and guitar lines, The song continues Halsey "exploration of different musical eras", according to Jessica Lynch of
Billboard. Critics believed it was reminiscent to the works of O'Riordan, especially for its "doo doo doo" vocalizations.
Exclaim! Karlie Rogers compared it to other Halsey songs like
Manic "3AM" (2020) and ''
If I Can't Have Love, I Want Power "Easier than Lying" (2021). Additionally, Slant Magazine'' Sal Cinquemani thought that it is "something
Avril Lavigne would sing". as she sings, "And I'm nervous what you'll think of me now". At the end of "Ego" bridge, Halsey reflects on how she "disguised [her] illness", referencing her diagnosis: "Who am I kidding? / I'm doing way worse than I'm admitting". An internal battle with herself, the song ends with the lyric, "I'm really not that happy being me". == Reception ==