This was because Anka had co-written the song with Jackson back in 1983, but was given no credit when the song came out on Monday. Jackson was listed as the sole songwriter. Back in 1983, the pair had a falling out and the single was never used on a Jackson album. However, it was used as a single for a Puerto Rican singer named Sa-Fire in 1991, being renamed as "I Never Heard".
Anka was given credit after his threat to sue and was given 50 percent of the copyright, making it a potentially a very good payday for the 68-year-old Canadian songwriter. This also will be a great loss in the Jackson estate.
You can find articles on it on Live Daily, Yahoo!, and Entertainment Weekly.
Here is a short clip of the single from YouTube. You have to go on Jackson's official site to hear the full song.