I believe it was 1966 when Jaco first recoiled in horror, pointing at his bass -four stringed, naturally - and shouted "BAD VIBES, MAAAAAAAN!" as he struggled with the emotion of tone-sucking shonkiness of his original, rare and future vintage, but not yet, Jazz bass. He tried to kill the crappy bridge with a butter knife, as legend has it, but slipped on a stray banana skin, missed, and inadvertently invented the first electric fretless bass and Jazz Fusion, all on a rainy Wednesday.