How to Delete Music on an iPod
When you go to download the latest release from your favorite band and find your iPod doesn't have enough space, delete some old songs to squeeze in the new tracks. If you have an iPod Touch with iOS 7 or 8, you can remove music right from the Music app, even while out of the house, without affecting the files back on your computer. For other iPod devices or older models of iPod Touch, deselect the categories you won't want anymore in iTunes, or delete the songs entirely to remove them from both the iPod and your computer.
Delete on IOS 7 or 8
Open the "Music" app on your iPod's home screen.
Switch to the "Albums," "Artists" or "Songs" tab. Deleting a playlist -- or deleting a song within a playlist -- does not actually remove music from your iPod.
Swipe from right to left along the album, artist or song you want to remove and then tap "Delete." Deleting music frees up space on your iPod, but won't erase the music from iTunes on your computer.
Delete in ITunes 12
Right-click any song on the "My Music" tab and choose "Delete" to completely erase the song from iTunes and from your iPod the next time you sync it. Do not perform this step or the next if you want to only remove the song from your iPod.
Switch to the "Albums" tab, right-click an album and choose "Delete" to remove an entire album from both your computer and your iPod.
Plug in your iPod and click the iPod icon to reach its Settings page.
Open the "Music" tab and make sure "Selected Playlists, Artists, Albums and Genres" is selected. Uncheck the items in each category you want to remove and then click "Apply." This method deletes the music from your iPod without removing it from iTunes on your computer.