Funny you haven't heard of Bert Jansch. No, he has never been that famous, but extremely influential. Jimmy Page owes much to him, at least his acoustic guitar playing.
Anyway, I thought that among the MK circle he is a bit more known, since MK thought highly of him even from his journalistic days, when he even wrote an article for Jansch's then group - Pentacle. His last albums were packed with collaborations from artists that wanted to play with him, like Johnny Marr (the Smiths-the well known) and Hope Sandoval (from Mazzy Star-if you don't know them , give them a try they had 3 albums out and they were great!).
Adams was the greatest B&W technician, his gray scale and three books The Camera, The Negative & The Print, are the bible for every photographer, at least for the pre-digital times. And the artistic value of his photos are great. But I don't get the prices they ask for anybody's photos. Maybe just for the fetish of the thing, a print made by Adams himself, would worth a bit more just for the history, but 150.000$ for a photo, that by nature is a reproductive art?