The fidelity of Doors recordings aren't spectacular, or even great. So there may well be no more NEW information to hear. That having been said the accuracy of the tonality should increase slightly.

Around 1966 my parents gave me a Norelco/Philips Carrycorder that played the new cassette format (with a S/N ratio of about 50db!). I commenced recording everything I could with very marginal results. The first 2 pre-recorded cassettes I found (at a Thrifty drugstore) were Portrait Of Genius by Ravi Shankar and The Doors. (Later High Tide And Green Grass by The Stones.) I was able to jack out to my "hi-fi" DuMont Hampton console B&W TV that had an 8 inch woofer and a 3 inch tweeter with a whizzer cone AND tone controls. It could really rock my little room. Listening to The End with incense burning. Must've freaked out my mom.