Can't put files onto my Nexus :(

[PikadudeN64]

What the title says. Seriously, I can't put any music on it. My computer will either stay frozen on copying the first song to copy, or it will tell me that the Nexus disconnected. I'm using the original cable that came with it, and I tried another one already. Any ideas?

 

[patruns]

What phone, what version of Android, PC or MAC? Do you have your device set to MTP when connected to your computer?