Intonation
The sing-song noises that you make when you talk. They can add some or all of the meaning to what you're saying, such as when you're being sarcastic.
Example:
I thought that jerk was being serious when he called me a stupid idiot until I realized from his intonation that he was being sarcastic.
I thought that jerk was being serious when he called me a stupid idiot until I realized from his intonation that he was being sarcastic.