According to the digital sheet music published at Musicnotes.com by Universal Music Publishing Group, "What I Want" was originally composed in the key of E major and set to a "driving rock" tempo of 140 BPM.
According to the digital sheet music available on Musicnotes.com by Universal Music Publishing Group, "What I Want" originated in the key of E major at a pace of 140 beats per minute, categorized as "driving rock".