"Mirrors '' is a mid-tempo progressive pop and R&B ballad with an approximate length of eight minutes and five seconds. It is composed in the key of E ♭ major, set in common time and has a moderately slow groove of 77 beats per minute. Timberlake 's vocals span from the low note of E ♭ to the high note of C (sheet music commonly prints the notes of a melody an octave higher to keep it within the staff). The original mix has an instrumentation of emo power ballad guitar strobes, hand - claps, orchestral flares, electro blips and chipmunk synth chirps accompanied with "vocoder - squawk backing vocals '', and the orchestra has a noticeable much - lower volume than the percussion and electric guitars.
what key is mirrors by justin timberlake in
E ♭ major