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Please follow the steps below to transfer music from your computer to your Samsung Galaxy Ace:
A. Download and install on your computer software called "Kies". Please check the link below - click here
Note: After Kies is installed, you don't have to start this software.
B. On your phone:
1. Tap Apps
2. Tap Settings
3. Tap Apps (application manager)
4. Tap Development
5. Uncheck USB Debugging.
C. Connect your phone to computer using USB cable. The computer will automatically recognize phone and load the designated driver for it. After model detection is completed, open the notifications panel on your phone (swipe from top to the bottom) and tap Turn on USB storage.
D. When Turn off USB storage is shown, it indicates that the connection is established.
E. On your computer go to Computer or My Computer. Your phone will be shown like new drive or Removable Disk. Simple copy/paste desired music from your computer to the music folder on the phone.
Please don't hesitate to ask if you have any difficulties. I will be happy to help with any follow up questions.