The best replacement for soundtrack is score.

The best alternatives to soundtrack are rated as following:
★★★★★  score
★★★  garageband
★★  soundbooth
★  ost
★  soundtrack
  hall pass
  sound track

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

Other search terms related to soundtrack and their ratings are:
★★★★★ paddle
★★★★★ honors
★★★ limits
★★ hallelujah
★★ love to rome
★ fade into you
★ paddle nature's calling
You have in mind a companion for soundtrack and it is not yet here? Propose!



Google Trends

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soundtrack
score
garageband