Reply To: Making a Song Out of a Pasuk

“klach: Even granting that we pasken that way for all pesukim, could you please ask your rebbi why he extends that halacha to a Rashi? The answer would interest me greatly.”

The problematic aspect of the song was the part that came from a passuk. Were the song merely Rashi, there wouldn’t be a problem at all. There are two problems with a passuk – song: 1 – Assur to use passuk of Torah or Shir Hashirim (and, acc to some, all of Tanach); 2 – There is a concept that we don’t like to say half a passuk of Torah, since Moshe Rabbeinu ended the passuk where it was supposed to end, and we therefore don’t deviate in our recitation of pessukim from that, pretty much regardless of context. So a song that either simply doesn’t go to the end od a passuk, or one where the words don’t fit exactly and some are repeated, is problematic.