Some may wonder whether she can really sing, but a source who has heard parts of Lisa Marie Presley's long-awaited debut album is all shook up. The source, who has no stake in the project, says Lisa Marie shows off a deep, sexy voice and a nice way with a tune on the yet-to-be-titled disc, which has been two years in the making. Lisa Marie co-wrote all the music, primarily with producer Glen Ballard, the man behind Alanis Morisette's breakthrough album "Jagged Little Pill," but Presley herself penned all of the lyrics for the album, which could be out this fall. One ballad, about her famous father, contains the line, "I want you to know I haven't forgotten you."