More straightforward, without added apps.
1. Plug droid into yoru computer USB
2. When you get message on droid, MOUNT the device
3. You will be able to browse the card. Look for the base directory where all the phone files/dir are, and create another subdirectory called /Music
4. Drag and drop desired music files/directories into this directory from your PC.
Yes, droid plays M4a files directly.
I don't get the sync programs. I have 100GB of music on my PC, last thing I want is a program to indiscriminately copy files. Maybe i am missing something. Now if I could teach iTunes which music I wanted synced, THAT would be nice.