Question: how to download music to my ipod shuffle for free?
Answer: Launch iTunes, and then connect the iPod to your computer using the iPod's USB cable.
Click the "iPod" button at the top-right corner of the iTunes screen. ... 
Click the “Music” button, and then select the “Sync Music” checkbox.
Select “Entire Music Library” to sync all songs each time you connect the iPod to iTunes.