He used it when performing the song "Sugar Blues" and many of the songs in his band's library of arrangements.

Then, years ago, I came across "Sugar Blues," in which William Dufty spells out his theory that sugar is a drug, not a food.

"Real heavy on the beer, not heavy on the attitude" was Sugar Blue's definition of a good blues club.

In addition, read Sugar Blues, a book by William Dufty.

In 1985 he moved to Chicago, recorded with various artistes including Sugar Blue.

Sugar Blue re-recorded the song on his 1993-album Blue Blazes.

His most popular book is Sugar Blues, first published in 1975, which cautions against white refined sugar, and presents its history and cultural influence.

Sugar Blue: harmonica (in "Telephone blues" and "Sick and tired")

In 1988, Guimarães travelled to Chicago, where he played with many American musician, including the harmonicist Sugar Blue.

Sugar Blues is a book by William Dufty that was released in 1975 and became a commercial success.