so i already downloaded cherub rock which is a great song btw

and i also downloaded comfortably numb by pink floyd and do i wanna know by the arctic monkeys 

so when i preview both songs it plays the preview but when i enter to play the songs it only shows the speakers in the background and i can still play like u can do a few seconds or during stops in the songs it just loads but forever 

can someone help me please , thanks :)

You probably forgot to put the .dll in rocksmith root folder : http://customsforge.com/topic/901-how-to-use-custom-dlcs-in-rs2014/

i didn't though but thanks