Aaliyah performs on Aug. 1, 1997 in Irvine, Calif.
While her debut album, Age Ain't Nothing But A Number, is widely available on major streaming services, the singer's estate has held back the majority of her remaining catalog, which includes her 1996 follow-up, One in a Million, and her 2001 self-titled album.
"In the meantime, however, we are working diligently to protect what is in our control -- Aaliyah's brand, legacy, and intellectual property," the estate continued. "In doing so, we will continue to release