"Unmatched by an artist the library holds" was presented as the matcher's
misses. On real data it is not: owning one album by an artist says nothing about
owning a particular single of theirs, and most of that figure turned out to be
drum and bass tracks streamed but never bought.
Split it in two. A title the library holds under some other artist is an
attribution disagreement -- a remixer credited as the artist, a guest billed as
one -- and is a genuine miss worth fixing; the report now names the artist the
library files it under, which is the information needed to judge it. A title the
library does not hold at all under any artist was never bought, and no
improvement to matching will conjure it.
The distinction matters beyond presentation. That figure is the gate on the
cull, and a gate computed from a number that overstates the failure rate blocks
work that is actually safe to do.
Emma Thorpe