Composition
"Unknown Caller" is composed in the key of G major. The song begins with a droning noise, the birdsong of Moroccan swallows, and exotic instruments, before The Edge begins playing a four note riff, similar to that of "Walk On". The chorus features a monotone group chant of commands ("Go / Shout it out / Rise up / Hear me, cease to speak / That I may speak / Shush now"), alternating with drawn out "Ohh / Ohh" lines. After the second chorus, a French horn part, played by Richard Watkins, as well as a church organ are heard. The song concludes with a guitar solo that was taken directly from the song's backing track.
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