For me, it depends on what you mean by "major musical discoveries". I grew up ’Classical’ until my mid-teens, where the need to fit in forced listening to more modern music. I ’discovered’ jazz in my 40s thanks to a gift of a ’greatest of...’ CD as a Secret Santa gift from a work colleague. As time progresses I find that I enjoy a broader set of music types/genres, but never a million miles away from the ’melodic’ tradition of Western Classical music.
I discover ’gems’ that I would not have appreciated earlier, but those gems are in the shape of single albums or at most artists. I can now listen to Michael Jackson and actually appreciate the music, not just find it boring or annoying as I did at 16. Do I like all of Michael Jackson, never mind ’80s pop? Not by a long shot - even just in Thriller there are tracks I don’t particularly enjoy. Is that a ’major discovery’? I dunno. By the same token, I really like Aion (2018) by Anna Thorvalsdottir - but my moment of discovery of avant-garde goes back to 1983, when I heard (and watched) Koyaanisqatsi with the wonderful images by Godfrey Reggio/Ron Fricke and soundtrack by Philip Glass.
@allenf1963 - thanks for the ’Bohren & der Club of Gore’ recommendation. I have listened to a couple of tracks on YouTube, and will be listening to more in a ’serious’ manner once I have again a working system!