What is the Other on my iPhone and How to Remove It
An "other" larger than about 1 1/2 GB usually indicates that the "other" includes corrupted files.
First try:
"First you go settings/general/usage/music/then left swipe over music and press delete and you would think it deletes your music but it doesn't instead it deletes your other but make sure your ipod is connected to a computer while doing this"
as recommended by:
How do I get rid of "other" storage: Apple Support Communities
Next, usually restoring from backup eliminated the corrupted files. However, sometimes restoring to factory settings/new iPod is required.
To restore from backup see:
iOS: How to back up
To restore to factory settings/new iPod see:
iTunes: Restoring iOS software