Who is the accepted author of Psalm 137, and if it was David Hamelech, then is it accepted as a prophecy?
Who wrote the anonymous explanations of Rashi printed within the text of Rashi? Sometimes when reading Rashi's commentary on the Torah one finds comments in parentheses that say things such as: ס"א, ...
When one says Tehilim there is a Yehi Ratzon which is published at the end which says "to be said after saying Tehilim". Who authored this Yehi Ratzon?