386 Subfield $a - Creator/contributor term:

Subfield $a contains a designator for the creator/contributor group category of the work being described.  It is repeatable if a creator/contributor falls into multiple demographic groups.

Examples:

130  #0  $aShort story masterpieces by American women writers

386  ##  $aAmericans$aWomen$2lcsh

100  1#  $aMozart, Wolfgang Amadeus,$d1756-1791.$tSonatas,$mviolin, piano,$nK.8,$rB major

386  ##  $aChild composers$2lcsh

[Work composed by Mozart in 1763 at the age of 7.]