He didn't release any songs in 1999.
It was released in 2001.
He was probably working on his Invincible album which was released in 2001.
Songs of Azores - 2001 was released on: USA: 8 March 2001 (New York Underground Film Festival)
Michael Bell - 2001 was released on: USA: 23 January 2001 (Slamdance Film Festival)
Good Entertainment with Michael Medved - 2001 TV was released on: USA: 15 December 2001
Beyond the Glory - 2001 Michael Irvin was released on: USA: 21 July 2002
It was released in October 2001.
Michael Jackson 30th Anniversary Celebration - 2001 TV was released on: USA: 13 November 2001 Australia: 19 November 2001
Kong The Animated Series - 2001 Sacred Songs 1-36 was released on: USA: 30 April 2006
No, Michael has more than 300 songs recorded that have never been released, nor heard by the public.
The John Kerwin Show - 2001 Michael Dorn 1-96 was released on: USA: 7 November 2011