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by uniqueid 1887 days ago

  Two bass notes a semitone apart won't necessarily 
  sound bad; it depends on the timbre.
Another factor is that the ear wants to makes repetition, in and of itself, work. That likely allows drums to sound good despite their fundamental tones often being 'wrong'. To pick an example at random: the triangle bells in this pop song sound pleasing, despite their key being 'wrong', simply because they repeat https://youtu.be/ZWmrfgj0MZI