In 1995, Phil Spector, who hadn't produced an album in 15 years, attempted to build his Wall of Sound around Celine Dion. Instead, he succeeded in erecting a wall between himself and Dion's team. Spector fans were crestfallen when he was booted from the producer list on Falling Into You for unspecified reasons in favor of such adult-contemporary standbys as David Foster. When EW asked Spector for comment in 1996, the reclusive producer responded with an 800-word letter praising Dion and railing against her associates. He characterized the work of the album's other producers as ''contrived and repugnant or nothing more than Whitney Houston- and Mariah Carey-rejected, soundalike songs . . . 'produced' by amateurs, students, and bad clones of yours truly.'' But ''should you wish to hear the amazing and historic recordings I made with Ms. Dion, have no fear. . . . Since I paid for them and own them, I am planning to release them on my label, for the entire world to hear, and compare . . . to her current recordings, or whatever you call those things they've released with her.'' He may or may not still have those tapes in his vault, but eight years later, with Spector facing some vault time of his own for an alleged murder (for which he has pleaded not guilty), we're not holding our breath for that particular indie release.