copy folder structure from internal memory to sd-card
If you use mv on a directory containing files and subdirectories, it will move all of them. But in this case you may not want to move the amazonmp3 directory itself, so the command would be mv internalmemory/amazonmp3/* /sdcard/music/, assuming the internalmemory directory is correct. 

The actual names for the internal memory and sd-card depend on the device, for example on my old Galaxy S they were /sdcard and /sdcard/external_sd/.