accompaniment

/ə.ˈkʌm.pə.ni.mənt/

IPA: /AH0 K AH1 M P N IH0 M AH0 N T/

noun
  1. 1

    A part, usually performed by instruments, that gives support or adds to the background in music, or adds for ornamentation; also, the harmony of a figured bass.

  2. 2

    That which accompanies; something that attends as a circumstance, or which is added to give greater completeness to the principal thing, or by way of ornament, or for the sake of symmetry.

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Source: https://en.wiktionary.org/wiki/accompaniment