Methods/Steps
First of all, to prepare for the popular music and itunes, music, each good, this example to square dance in the most commonly used in the small apple as an example. itunes download decisively go to apple's official website to download can: /itunes/download/.
Prepared, even if it is "everything is ready, all we need is the east wind". As a ringtone, try not to be too long, control in 15~30 seconds is good. Open itunes and record the start time and end time of the ringtone according to the music playing time.
After determining the start time and end time, right-click on the music and click Show Profile. In the dialog box that pops up, select Options.
In Options, place a check mark in the Start and Stop columns and set the time you memorized in step 2, then click OK.
After that, you will see that the file becomes only 10 seconds or so, and the playback is the part you want to intercept.
Click on the Album drop-down menu in the upper right corner and set it to Song. After setting it up in right click on the file and select Create AAC Version.
You'll notice an extra music file of 15 seconds in length. Right click on this file and select show in windows explorer. In explorer, we see this file and it is the prototype of our ringtone.
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Change the file's original extension from .m4a to .m4r and click "Yes" in the pop-up dialog box. Sync the renamed file to your iPhone ringtone using itunes and you're done.