I guess we all know that Anthony Jackson being instrumental in the devellopment of the extended range basses and that he also used his Carl Thompson six string "Contrabass" on several recordings but eventually abandoning the instrument since the tight string spacing made it difficult to play. He picked the idea up again in the eighties when Ken Smith made him a bass with proper wise string spacing, inventing the extended range basses as we now know them today. But let's talk about those early recordings of the extended range basses and of people tuning down. I'll start with Anthony Jackson using his Thompson contrabass on "What would I do, if I could feel?" from the soundtrack of "The Wiz" 1977, probably the earliest use of a low B string on a purposely built extended range bass.