Step 1: Download Tansee iPhone Transfer free from  here, then install it. You also need iTunes above 7.3 installed.

Step 2: Connect iPhone to your computer.

Step 3: Launch Tansee iPhone Transfer and all the content of your iPhone , including music and videos will display automatically, screenshot as follows:

How to copy music and video from iPhone to computer

Step 4: Select the files to be transferred to your computer by click them. Ctrl key for multi-files select. Click right mouse button or click "file" can select all songs.
Note: you can only select first 5 songs if you haven't purchase.

Step 5: Click "Copy" button to select output path and start to transfer songs or videos to your computer:

How to copy music and video from iPhone to computer


How to Transfer Song from iPhone to iTunes Music Library?

Step 1: Transfer your songs / videos to a folder on your computer by Tansee iPhone Transfer, e.g. "C:/music" .
Step 2: Run iTunes, click "File", click "Add Files to Library..." or "Add Folder to Library..." , select the songs in folder C:/music.
Or simply run iTunes, Drag your files in "C:/music" to your iTunes music Library.
more information refer to http://totosoft.net/site/how-to-copy-music-and-video-from-iphone-to-computer-/info_38.html