Write an article based on this "Open iTunes. Click Library. Select a song. Write down the start and stop times of the segment you want to use. Right click on your selected song. Click Song Info or Get Info. Click the Options tab. Enter the start and stop times. Click OK. Click the song once to highlight it. Click the File menu. Click Convert. Click Create AAC Version. Remove the start and stop times from the original file."
If you’re using a Mac, click music note icon on the Dock, which is usually at the bottom of the screen. If you’re using Windows, you’ll usually find iTunes in the Start menu (sometimes in a folder called All Apps). If you’d rather download a ringtone from the iTunes Store, see this wikiHow. It’s near the top-center part of iTunes. This displays the contents of your library. To use a part of a song as a ringtone, it must already be in your library, whether you’ve purchased it from iTunes or imported it from elsewhere. When selecting a song, choose one that has a solid 20 second (or less) segment of sound you want to hear when your phone rings. Play the song and write down the exact time within the song you want the ringtone to begin, then write down the time in the song where it should end.   Example: If the part of the song you want to use begins exactly 50 seconds into the song, write down “0:50” as the start time. If you want the ringtone to stop at at 1 minute and 10 seconds into the song, write down “1:10” as the stop time. If the segment you choose is shorter than 20 seconds, the tone will repeat until the call is answered, canceled, or routed to voicemail. A menu will appear. This opens a window that contains details about the file. It’s near the top of the window. Check the boxes next to “start” and “stop,” and then type the start and stop times you wrote down. It’s at the bottom of the window. Now that you’ve set times, listen to the track to make sure it sounds the way you’d like it to sound as your ringtone. Make any changes to these times as needed before you move forward. The song is now ready to be converted. It’s at the very top of the screen (on a Mac) or at the top of iTunes (on a PC). It’s near the bottom of the menu. Another menu will expand. This creates a ringtone file from the start and stop points of the selected song. You should see the new version of the song right beneath the original file. If you don’t see both versions of the song, it might be because you’re viewing a playlist. Try searching for the song’s title or artist in the search bar at the top of iTunes. You’ll want to reset the start and stop times of the original file you can listen to the whole song in the future. Here’s how:  Right-click the original song and select Song Info. Remove the check marks from “start” and “stop.” Click OK.