the man was getting heckled. im listening to a weather report bootleg from 5-30-76 at the roxy (my dad was at this gig!) and jaco takes his normal solo spot. at the start of his solo, some guy in the audience yells "hey,where's alphonso!" then you hear another scream when he starts his onkonkole y trompa harmonic thing. this time its "tune it you stupid rookie!" at this point jaco had only been in the band for like a month and at times it shows. but just to think, the guy's catching hell from some bone head in the crowd and ends up becoming a legend.