  ...   Once ▁I ▁realized ▁how ▁the ▁song ▁comes ▁across ▁if ▁s ung ▁by ▁a ▁gu y , ▁that ' s ▁when ▁I ▁decided ▁to ▁give ▁it ▁away ." ▁ ▁Com position ▁ ▁" I r replace able " ▁is ▁a ▁mid - tem po ▁ball ad ▁with ▁pop ▁and ▁R & B ▁influ ences . ▁Writ ten ▁in ▁the ▁key ▁of ▁B ▁major , ▁the ▁beat ▁is ▁set ▁in ▁common ▁time ▁and ▁moves ▁at ▁a ▁moder ate ▁ 8 8 ▁be ats ▁per ▁minute . ▁Bey on cé ' s ▁vocal ▁range ▁in ▁the ▁song ▁sp ans ▁nearly ▁two ▁and ▁a ▁half ▁oct aves , ▁from ▁B 2 ▁to ▁E 5 . ▁While ▁most ▁of ▁the ▁songs ▁on ▁the ▁album ▁are ▁ag gress ive ▁and ▁u pt em po , ▁her ▁voice ▁on ▁" I r replace able " ▁is ▁ton ed ▁down . ▁" I r replace able " ▁uses ▁a ▁g ently ▁str um med ▁ac oust ic ▁guitar , ▁following ▁the ▁B 5 – F 5 – C m 7 – E 6 / 9 ▁ch ord ▁series . ▁Herm ansen ▁and ▁E ri ks en ▁combined ▁the ▁classic ▁ch ord ▁pro gression ▁on ▁an ▁ac oust ic ▁guitar , ▁a ▁modern - s ounding ▁ 8 0 8 ▁drum ▁beat ▁and ▁cell os . ▁Al ▁Sh i ple y ▁of ▁St yl us ▁Magazine ▁noted ▁that ▁the ▁guitar ▁str um ▁can ▁be ▁found ▁in ▁R ih anna ' s ▁ 2 0 0 7 ▁single ▁" H