I just installed the PyDDR v0.6.0 ebuild on my Gentoo system. PyDDR is expecting /usr/share/pyddr/songs where Gentoo installs the songs at /usr/share/games/pyddr/songs. I fixed this on my system by making a symbolic link, though I suspect that the correct solution would be to install both ebuilds in the same location.
Resolved in newer versions of the ebuild.