The best replacement for sing is extreme magic sing.

The best alternatives to sing are rated as following:
★★★★★  extreme magic sing
★★★★  hum
★★★★  wow magic sing
★★★  sang
★★  lip sync
★★  hum to identify song
★★  aayla secura
★★  not to sing
★★  confuse ray
★★  wow
★★  magic mic
★  sings
★  xtreme magic sing
★  ahsoka
★  singstar
  mediacom
  song

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

Other search terms related to sing and their ratings are:
★★★★★ jubilation
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sing
extreme magic sing
hum