These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/Audio-Scan-1.10.0-r4::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 4715 KiB
[ebuild  N     ] dev-perl/Audio-Musepack-1.0.1-r1::gentoo  PERL_FEATURES="ithreads (-debug) -quadmath" 103 KiB

Total: 2 packages (2 new), Size of downloads: 4817 KiB