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 go inside ~/Library since it's hidden by default in the finder
XBox 360: Place files: "_xbox" to "Content>0000000000000000>555308C0>00000002";
PS3: Install files: "_ps3.psarc.edat" to "/dev_hdd0/game/BLUS31182/USRDIR/DLC",
if the folder DLC does not exist, just create it.
Note: If you are intending on using Custom DLCs on a PS3 or XBox, you MUST jailbreak your console first!
Hacking or jailbreaking a console is beyond the scope of what we are doing here, and if you are not comfortable with doing it, you may want to simply buy the PC version of the game.
JUST PLAY IT !
All credit to MarineIguana, he created this, I am merely echoing it here.