It's quite easy
Method 1: Delete songs directly from your iPod Touch:
Open the Music app on iPod touch > Choose the Songs tab > Find the song you want to delete > Slide over that song and you will see a red "Delete" button > Click it to delete songs from your iPod touch.
Method 2: Delete iPod Touch songs using iTunes:
Plug your iPod to your PC or Mac and click on the "Music" icon that is at the top left of the application in your iPod. Click the check mark to the left of any song that you want to remove from your iPod then sync your iPod again, and the songs will be removed from your iPod.
You don't need a third-party program/app for this.
How To Delete Songs Straight from Your Ipod 4th Generation
1. Go to your Music App
2. Go to a song that u would like to delete
3. Then Slide your fingers across the song
4. After u slide your fingers you should see a RED DELETE Button and TAP Delete
AND THIS HOW U CAN DELETE MUSIC STRAIGHT FROM YOUR Ipod
- If you go to your Settings and Tap General and CLICK About and It does give u back your GB