A folksinger or troubador sings for his supper, or just for fun, to make people happy, maybe himself.

Generally this person can't sing the words to a song the same way twice. Maybe they never did get the "right" words and maybe they have intentionally changed them because they wanted to.

Now if you feel you'd like to be like that but also feel some hesitancery or trepication, I suggest you print out the following and keep it handy:

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This license certifies that
   
is a Poet & Folksinger

and has the right to
- create or modify any lyrics or tune
- put any lyrics to any tune
- perform such old, new, or modified songs
- in any place at any time*
- and print up licenses like this
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Our job as folksingers is partly to preserve the old songs as they were, but also we're spose' to improve them.

* There be some caveats to this if money is changing hands. Copyrights, lawyers; but a person can sing anything they want for free