https://www.altpress.com/news/universal-music-group-fire-lawsuits-expected/ Others such as Chuck Berry, Aretha Franklin, (speeches from) Martin Luther King Jr (and others), and others. https://trap-a-holics.com/700-further-artists-affected-by-universal-warehouse-fire/ All I can imagine is if these were digitized and archived in original form, then a second copy of that made for remastering, little if anything is lost. Modern day (last decade or so?) methods would exceed the range of audiotape. Being on audiotape, the masters would still degrade to unplayable status over the span of decades -- even under ideal conditions but these were not stored in a low-oxygen, low-humidity cool area like a salt mine. It's not quite the same thing for film, but technology is soon to be viable. Today's 2K standards are fairly close and depending on speed of 35mm film used, 2K if not 4K is a sufficient backup for digitizing film masters. 8K @ 32bit for TV shows and most films would probably be more than enough to get every last bit of sharpness and color hue from each particle in the negative. Still, even under ideal conditions, videotape can succumb to "the vinegar effect" after a few decades. But I digress. A master is still a master and once it's gone, only the best quality copy is left. At least, with audio sources, it is likely if not having been possible for some time to capture the entire range of sound from a master and then some. All I know is, as a fan of 60s soul, Aretha's music sounded horrid on consumer-grade cassette tape and every remastered edition was a LOT clearer, any limitations being due to the recording equipment of the time.