The best replacement for buble is connick.

The best alternatives to buble are rated as following:
★★★★★  connick
★★★★★  frank sinatra
★★★★  sinatra
★★★  harry connick jr
★★★  groban
★★★  robin thicke
★★  josh groban
★★  robbie williams
★  jamie cullum
★  jack black
★  jason mraz
★  blake shelton
★  shelton
  as we natives say
  john mayer
  luis miguel

Your alternative for buble is not listed? Suggest!
Speaking about buble, one probably shouldn't forget about sam.

Other search terms related to buble and their ratings are:
★★★★★ sam
★★★★ 15 year old
★★★ kid singing
★ thalia
You have in mind a companion for buble and it is not yet here? Propose!



Google Trends

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buble
connick
frank sinatra