Curiously, I came across his obituary at almost the same time I saw this article about the last Virgin Megastore in the U.S. closing. For it was a Virgin Megastore, in my case the one on Oxford Street, London, that introduced me to Hopper's music and bass playing with a copy of the album, 1984 that I found in a cut-out bin for maybe £1.99 and took a chance on.
I loved and still love this record and it led me back into Hopper's playing with Soft Machine. He became my favorite electric bass player. Here's a nice tribute to the man using the Soft Machine track, Kings & Queens.