The best replacement for classical is operant conditioning.

The best alternatives to classical are rated as following:
★★★★★  operant conditioning
★★★★  acoustic guitar
★★★  keynesian
★★  romantic
★★  romantic music
★  keynesian economics
★  operant
★  baroque
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★  classic
★  neoclassical economics
★  quantum
★  quantum mechanics
★  jazz
★  neoclassical
★  modern liberalism
  steel string guitar
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  baroque music
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  classique
  modern
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  charlotte mason
  structural realism
  modern physics
  keynesian theory

Your alternative for classical is not listed? Suggest!
Speaking about classical, one probably shouldn't forget about hip hop.

Other search terms related to classical and their ratings are:
★★★★★ hip hop
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classical
operant conditioning
acoustic guitar