 there was a kind of a formula to calypso. There were only 12 bars, seams, and then a calypso neck can just take any of those 12 bars and make any kind of permutation and combination, and bingo, you've got a calypso. But when Sparrow came, he kind of expanded beyond those 12 bars. If you look at his style in the 50s and the 60s and the 70s, you may compare him with the kind of thing that Curtis Mayfield did.