My daughter, Luna Schoysman, and I have designed this t-shirt.

The face comes from a scan of Bill's picture on the package of his tuners. Luna then completely reworked it to achieve this result.

As for the Circle of Fifths, I had preciously kept the sheet Bill gave me at my first workshop when I was 15 (in 1982). So, it is Bill's handwriting on the t-shirt...

Both combined, gave this result