The best replacement for instrumental is expressive.

The best alternatives to instrumental are rated as following:
★★★★★  expressive
★★★  intrinsic value
★★★  hostile aggression
★★  intrinsic
★★  terminal values
★★  vocal music
★★  expressive violence
★  expressive roles
  detrimental
  karaoke
  terminal
  its intrinsic value
  affective
  constitutive

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

Other search terms related to instrumental and their ratings are:
★★★★★ audacity
★★ or without you
★ me eminem
★ you usher
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Google Trends

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instrumental
expressive
intrinsic value