I don't know how to delete songs from my phone! and my phone doesnt show me the any button for send music or any thing for the iPhone 4

iTunes.

Go to your iTunes library of music. UNCHECK the songs you don't want from that list. Then resync the phone and it'll remove all that you unchecked from the phone...

Confusing and over complicated, yes. But the list on iTunes is the list in the phone. So what ever you check or uncheck is whats on or off the phone

Hi,

As with much to do with the iPhone, there's a bit of a trick to getting this working smoothly so you can have control over your iPhone music, while keeping it as darn easy to work with as possible. The answer? Create a custom playlist for your iPhone music library.
Let me show you how to do it - it's pretty darn easy.
Pop into iTunes and choose File --> New Playlist. Now rename it to something logical: I use "iPhone Sync":


Now you can just drag and drop music from your iTunes library (in iTunes, needless to say) into this new playlist. When you're ready, you'll see a bunch of music happily ensconced in the playlist (remember, it's all just "pointers": the actual music files are still safely in the main music library, so if you delete something from a playlist , you haven't deleted the original music file itself):

At the bottom of the iTunes window it shows you how many songs are in the playlist, along with the size and total playing time.
At this point, you need to plug in your iPhone if you haven't already done so. It'll pop up the usual summary screen:

Now click on the "Music" tab and you'll see that you can select "sync playlist". Do that, then select the new iPhone sync playlist you've created

Set things up and that's all there is to it. Now click "Sync" in iTunes and it'll synchronize your playlist with the iPhone music library and next time you click on that ole' "iPod" button on the iPhone, your selections from you music library will be present.
Oh, and one really nice feature of creating this playlist is that you can manage it, adding and deleting songs to your heart's desire, even without your iPhone present. Whatever changes you make are instantly applied to your iPhone music library the very next time you synchronize the device. Suddenly even 8GB might feel small. :-)

Regards

The easiest way is to open iTunes on your computer, and delete the song from iTunes.

Next, sync your phone. This will remove the song from your phone

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
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That's easy. Do the following steps:
1. Plug your iPhone to your computer.
2. Open iTunes from your computer.
3. Select you iPhone under the devices menu.



... If you take a closer look at the first image, on the "Options", this is what you'll see:


4. In my case, I sync my entire music library, so if I want to delete a certain song from my iPhone, I just uncheck it from my iTunes music library before I sync. If we have the same case, then you just have to go to your music library (which is the top selection from the sidebar)...



... and uncheck the songs that you want to delete from your iPhone.

But when you sescted the other option - Manually manage music and videos, click on the triangle before youre device's name.



Now, select "Music", under your iPhone's name and right click on the song you want to delete, then select delete.
Hope this helps.
For more iPhone and iPod touch tips, click here.

If you want to delete music from iPhone, you can take fully advantage of iTunes. After you purchased songs in iTunes Store on iPhone, your iTunes will also save the purchase history, so you don't have to worry about losing the purchased music files. When you connect iPhone to computer with USB cable, iTunes will launch automatically and recognize your iPhone. You can create a new playlist which contains only the music you need, and then sync it to your iPhone. By doing this, you can remove the unwanted music from iPhone.

1. Click the iPhone icon at the upper left corner.
2. Choose Music in the left sidebar.
3. Check Sync Music choose Selected playlists, artists, albums and genres.
4. Select the playlist which only contains the songs you need. Then click Sync.

http://www.leawo.org/tutorial/how-to-delete-multiple-songs-from-iphone.html

1. Download iTunes.
2. Connect your iPhone to the computer.
3. On iTunes, you should see your iPhone listed under Devices.
4. Click on your iPhone.
5. Go to the Music, Applications, TV Shows, and all those other tabs and set your preferences.
6. Click Sync.
Now you can send music from iTunes to iPhone.

If you didn't have the songs on the iPad before you updated but you purchased it, there is a
feature enabled by default that shows all music. to turn it off go to settings/music/show all
music-off. Otherwise, to delete music, swipe from right to left over what you want to delete.

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

you should be able to go into itunes and delete the songs, then sync your iphone again. If that doesn't help then I would go into the apple store and see why not. you can also just call apple for support for free if you are an at&t subscriber good luck