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

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

[ebuild  N     ] media-libs/libcuefile-477-r4::gentoo  41 KiB
[ebuild  N     ] media-libs/libreplaygain-483-r1::gentoo  9 KiB
[ebuild  N     ] media-sound/musepack-tools-495-r1::gentoo  146 KiB

Total: 3 packages (3 new), Size of downloads: 195 KiB