I don't have time right now and people keep asking. It has NOTHING to do with how the record is cut. It's something that appears in the actual label area of the record and is a byproduct of manufacturing. The deep groove in the label has NOTHING to do with sound quality, just a pressing plant thing... , Blue Note never owned a record pressing machine. They used the presses of the cheapo Plastylite company. W.B. and others, please chime in, gotta run..