The band experimented with several different versions of the keyboard loop, before deciding on the one used in the final version. Lead singer
Chester Bennington explained that they used over 60 different beats for this song until they found a suitable one. They also used different types of instruments like banjos at first, experimenting with different styles until they came up with something that would fit the track. The song is based around the
Doomsday clock counting down, and the song concludes at the end with the Doomsday clock having reached midnight, which is the time that is perceived that humanity breaks down due to catastrophic failures of peace, existence and life itself. Like "Breaking the Habit", "Shadow of the Day" uses samples of live string ensemble recordings, played by
Mike Shinoda. The song is written in the key of
B major, the first major key the band has ever used. The chorus is based on the very common
I–V–vi–IV progression (B, F, Gm, E in the key of B major). On the verses, the chord progression is the less common vi–V–IV–IV (Gm, F/A, E, E). The end of the album version of the song, which is an instrumental piece, crossfades into the start of "
What I've Done". It is the second-longest track on the album. Shinoda joins Bennington on the lines "Sometimes beginnings aren't so simple, sometimes goodbye's the only way" and the last three choruses. It is the band's first song where Bennington played rhythm guitar live (if not including the band's mash-up from
Meteora World Tour, named "Step Up/Nobody's Listening/It's Goin' Down", where Chester also played rhythm guitar, specifically on "It's Goin' Down", which also was performed fully on the band's
Hybrid Theory Tour), due to the requirement of a second guitar in the final chorus, and Shinoda, who typically acts as a second guitarist played keyboards instead. However, this is not the first song on which Bennington plays guitar, since he plays it on the highly-processed intro of "
Somewhere I Belong". Later, Bennington would also play rhythm guitar on live performances of "
Iridescent". Bennington would also play rhythm guitar on live performances of a few songs from the album
One More Light before his death in July 2017. The song was remastered for iTunes in 2013, with a new arrangement of strings. ==Music video==