Can't sync all of my music to my SD Card?

[LJ Washington]

Got a Verizon Sammy S5, Got a new 64g SD card. Running Kitkat 4.4.4. checked for the latest update all it good. MBP OS X latest updates.
Using the Android transfer app. And it will not allow me to drag & drop all my song. So I give DoubleTwist a try and it fails to sync a few of my 2800 songs.
I read somewhere that you have to root the S5 to allow this. Is that true?
Suggestions please I couldn't find anything when I searched.

Thanks in Advance.

 

[SmaugHat]

Might some of the problem songs be protected? The new ITunes cloud stuff has tied me in knots transferring stuff.

 

[LJ Washington]

80% of my music was downloaded for itunes, so yes.
any work arounds?