I tag all my music for Apple as I use Apple Music/iTunes. I use the following script in Picard and it works:
$setmulti(composer,%composer%)
$setmulti(lyricist,%lyricist%)
$setmulti(writer,%writer%)
$copymerge(composer,writer)
$copymerge(composer,lyricist)
$unset(writer)
$unset(lyricist)
$set(composer,%composer%)
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