DOWNLOAD CUSTOM SONG FOR YOUR PLATFORM INSTALL INSTRUCTIONS:   PC: DOWNLOAD our tool to install the fix Copy file: "_p.psarc" to "dlc"; Mac: Follow the instruction over there : https://customsforge.com/index.php?/topic/33889-how-to-add-custom-songs-on-mac/ Copy file: "_m.psarc" to "~/Library/Application Support/Steam/SteamApps/common/Rocksmith2014/dlc/",  you might need to use "Command-Shift-G" to g