How to transfer music from iTunes to iPhone?

Hello,
I recently replace my iphone with new one from apple store. When I connect my iphone to PC for synchronization, my all songs in iphone are transferred to iTunes. But after this I unable to get these songs from iTunes to iphone. Can any one tell me how to transfer music from iTunes to iphone?
Thank you.

Just try following steps:
1.First connect your iphone to your PC.
2.Open iTunes application.
3.Now choose your iphone icon under "Devices" option from the iTunes source list.
4.Now you can find various tabs for iPhone synchronization in iTunes.
5.Click on Music tab.
6.Now choose all songs.
7.And now click on "synchronize" button.
8.In this way you can transfer your all songs from iTunes to iPhone.

For transferring music from iTunes to iphone you have to create one custom playlist in your music library. You have to just drag your all music in that playlist. After creating playlist give it proper name. Now connect your iphone to PC. Click on music option. Now under music you can see "sync playlist" option. Click on it. Now select newly created playlist. Now click on "Sync" button. Now your all desired songs will transfer to your iphone one by one.

For transferring music you can use following steps:
1.First you have to set iTunes to "not synchronize" mode.
2.Now connect your iphone to computer.
3.Open iTunes.
4.In right hand side you can find "Music" option.
5.Now play all your favorite songs in iTunes.
6.Now click on "sync" button.
7.Now your all songs will automatically transfer from iTunes to iphone one by one.

Connect your phone to iTunes and do the following:
1. On the summary tab of your iTunes sync settings check "Sync only checked songs and videos"
2. In your music library check all the songs you want to sync to your phone
3. Make sure there are no exclamation points next to any of the songs you want to sync to your phone
4. Make sure you have authorized your computer for all Apple IDs for purchased music you want to sync to your phone (in Store>Authorize This Computer)
5. Check "Sync Music" on the Music tab of your iTunes sync settings
6. Sync your phone