Arranging (IMO)

on the adding changes, that's something sometimes so subtle but it works in holding a freshness to the 3 minute pop tunes in general it seems.
folk music could be maybe more stripped down, if its hardcore folk like acoustic /vocal only...then not much to add other than overdub a lick or two.

as for the royalty cash wars , that movie of Beware Ginger Baker, he really goes off on that a little, about getting nothing for his large input on the songs. He changed the tempos that completely changed the tune but he got nothing in songwriter royalties.
when I was 6 or so, the Beatles stuff I thought wow! those guys played all the instruments! but then decades later find out George Martin did so much and the orchestra parts weren't done by paul,joh,ringo,george..lol
"Folk like acoustic/vocal only" can still have changes from verse to verse. Expressive vocal phrasing and shifts of emphasis in the accompaniment can accomplish the renewal of interest that might need a bridge or guitar break in rock.
 
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