One of the mysteries of the English language finally explained.
1‘in modern jazz players extemporize in a very free manner’
improvise, ad lib, play it by ear, think on one's feet, cobble something together, throw something together, make it up as one goes along, take it as it comes
informal busk it, wing it, do something off the cuff, do something off the top of one's head, do something on the spur of the moment
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