How do i delete songs from an Iphone 3gs - Apple iPhone 3G Black Smartphone

I prefer Leawo iTransfer to help me to delete songs from iPhone 3GS. You can also complete this task by following the below steps.

Step 1. Run Leawo iTransfer and connect iPod to computer with USB cable. The software will recognize and detect your iPod.
choose Music
Step 2. Click the name of iPod and choose Music in the left sidebar. The iPod music will display in the right part of the software window.
click the Delete button
Step 3. Hold Ctrl/Shift key to select the songs you want to delete, and click the Delete button at the top middle. Or check the square checkbox beside Name to select all songs, and then click the Delete button.
start deleting music from iPod
Step 4. After clicking the Delete button, you'll see a pop-up dialog. Click Yes in the pop-up dialog to start deleting music from iPod.

For more details, check: Top Three Ways to Delete Music from iPod/iPod touch

You can use iTunes, if not, you can try to use Music Clean up!

It's no longer possible to delete songs from iPhone in iOS7. To remove music:
1) Find a PC/Mac
2) Install iTunes if it is not installed
3) Connect your device
4) Tell your device to trust the computer if it asks
5) Switch over to the device view
6) Browse to your music on the device
7) Delete it
Getting music off isn't as easy as putting it on but the swipe gesture now goes back in menus on which you can get a new interface of iPhone Data Eraser.
iPhone Data Eraser Erase Data Safely Protect Personal Privacy How to Delete Songs from iPhone

1.Go to Settings
2. Go to General
3. Go to Usage
4. Wait for Storage to load
5. Go to Music and swipe
6. Delete will pop up
7. Press Delete
This will delete ALL songs, but will not remove the music app.
There you go.

How to Delete Songs from iPhone
iPhone Data Eraser Clean up Data Safeguard for Ultimate Privacy...

Adding and deleting songs should be fairly easy, using iTunes.
You can either:
-Sync your playlists to your phone. (when you delete a song from a playlist and sync it deletes the song from your device as well)
-Manage your music manually (you need to check the "manage music manually" box). It is pretty straightforward, just drag and drop any song from your library to your iPhone to copy it, or press delete on the ones you no longer like to keep on your phone.