Question: how to make a song in your itunes library a ringtone?
Answer: Step 1: Open and update iTunes or Music. Step 2: Choose a song. Here's the fun part — pick the song that you'd like to use as your new iPhone ringtone. ...  Step 3: Add the start and stop times. ...  Step 4: Create an AAC version. ...  Step 5: Copy the file and delete the old one.