The best replacement for jls is one direction.

The best alternatives to jls are rated as following:
★★★★★  one direction
★★  rough copy
★  take that
★  n dubz
★  robbie williams
★  one direction who is better
  teebird

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Speaking about jls, one probably shouldn't forget about tinie tempah.

Other search terms related to jls and their ratings are:
★★★★★ tinie tempah
★★ alexandra burke
★★ miranda
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Google Trends

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jls
one direction
rough copy