While she's shown to enjoy singing and has even performed a few times, she doesn't have a signature song like some other TV characters.
However, she does sing a few songs throughout the show, including:
* "Leave It All To Me" with Drake Bell's character, Drake Parker. This is the theme song for iCarly, and they perform it several times on the show.
* "You're The One That I Want" from the musical "Grease."
* "What I Want" from the movie "The Lizzie McGuire Movie."
* "Baby One More Time" by Britney Spears.
It's worth noting that Carly's singing talent isn't always perfect, and she often makes funny mistakes. However, she's always confident and enjoys performing.