The best replacement for echoes is echos.

The best alternatives to echoes are rated as following:
★★★★★  echos
★★★  flames of eternity
★★  lilianfels
★★  phantom of the opera
★  atom heart mother
★  echo's
  sixth sense

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Speaking about echoes, one probably shouldn't forget about 2001.

Other search terms related to echoes and their ratings are:
★★★★★ 2001
★★★★ space odyssey
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echoes
echos
flames of eternity