Instructions
Open the Roblox Studio and load your level that you want to add music to.
Select the object you want to add music to. The object will become selected.
Click "Insert" from the top toolbar, mouse over "Services" and then click "Sound." The sound window for the object will appear.
Click the "Browse" button from the sound window. A standard Windows explorer window will appear.
Locate and click on the sound file you want to upload. Copyrighted or licensed music files will not play or be loaded onto the object properly, but you can upload your own created sound files.
Click "OK" on both the standard Windows explorer and sound window to upload the music to the object. Once you load the level, the music will begin playing from the object.