B*gg*r my grammar skills - my last synapse misfired.

The music produced later which borrows from "folk music" as described in the difinition. Is it still folk or has it become something else?

For example we hear motets and phrases in a number of "classical" compostions that are defined as being borrowed from folk music. So does that make the classical piece folk. Because the folk song has been reshaped and added onto.