To the greatest extent permitted by, but not in contravention of, applicable law, I hereby overtly, fully, permanently, irrevocably and unconditionally waive, abandon, and surrender all of my Copyright and Related Rights and associated claims and causes of action, whether now known or unknown (including existing as well as future claims and causes of action), in the Work "A sad corner of free-to-use lyrics" (i) in all territories worldwide, (ii) for the maximum duration provided by applicable law or treaty (including future time extensions), (iii) in any current or future medium and for any number of copies, and (iv) for any purpose whatsoever, including without limitation commercial, advertising or promotional purposes (the “Waiver”). I make the Waiver for the benefit of each member of the public at large and to the detriment of my heirs and successors, fully intending that such Waiver shall not be subject to revocation, rescission, cancellation, termination, or any other legal or equitable action to disrupt the quiet enjoyment of the Work by the public as contemplated by my express Statement of Purpose.
-official CC0 text
In other words: The work "A sad corner of free-to-use lyrics" has been released into the public domain, for an infinite duration, by the creator, Sicklefang, on the 25th of June, 2020.