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If you keep a lot of music on your iPad, its likely taking up a sizable chunk of your storage space. iTunes Match is a paid service from Apple that allows you to stream your entire iTunes library to your iPad (or any other Apple device or computer). This can free up tons of space, as you'll no longer need to keep any music files stored on your iPad. Click here for instructions on setting it up.  There are some drawbacks to the service. Besides costing $25 per year, you'll only be able to stream when you have a network location. You can always download any of your songs to your iPad ahead of time if you're anticipating being without a network connection. iTunes Match allows you to upload songs that you didn't purchase through the iTunes Store. You can also use services like Google Play Music to upload and stream your music. If you opt for a streaming service, or make the switch to internet radio, you can delete all of the music files from your iPad at once. Any purchased music will still be downloadable from the iTunes Store.  Open the Settings app. Tap "General" and then select "Usage". Tap "Manage Storage" in the "Storage" section. Tap the Music app. You may have to wait a few moments for it to appear. If your Music app isn't listed, you don't have any music files actually stored on the iPad. Tap the "Edit" button. Tap the "-" next to "All Songs" and then tap "Delete". You can also delete individual songs this way. If you just want to delete certain songs, you can do so from within the Music app. Be aware that depending on your settings, songs may be visible that aren't actually stored on your iPad (iTunes purchases, iTunes Match songs, etc.).  Open the Music app on your iPad. Find the song or album that you want to delete. Songs that are not downloaded to your iPad will have an iCloud icon on the right side of the song. Swipe the song or album to the left to reveal the "Delete" button. If you cannot swipe a song, it means that it is not downloaded to your iPad and therefore not taking up space. If you cannot swipe an album, it means that one or more songs on the album are not downloaded on your iPad. You'll need to delete individual songs from within the album. Tap "Delete". This will delete the song or album from your iPad. If you see the "Remove" button instead of the "Delete" button, it means you are in Playlist view. You must delete songs from the Songs, Albums, or Artists view. If you've downloaded movies, TV shows, or music videos from the iTunes Store, they could be taking up a lot of space. HD videos in particular can be huge. Removing videos after you watch them can make room for a bunch of other things.  Open the Settings app on your iPad, select "General", and then "Usage". Tap "Manage Storage" in the "Storage" section. Select the Videos app. If you have a lot of videos downloaded, it will likely be one of the last apps to appear, and should be located towards the top of the list. Review your videos. You will see each video stored on your iPad, along with the size. TV shows will display the size of all the episodes on the iPad, and you can tap the show to see the size of individual episodes. Tap "Edit" and then tap the "-" next to the video you want to remove. Repeat for any other videos you want to remove from your iPad.
Consider signing up for iTunes Match. Delete all of the music on your iPad. Delete individual songs from the Music app. Delete movies and videos.