42: Which classic slow Mo Oshiv do you mean? Is it the very very very old classic? That’s just traditional. You probably mean the one from the MBD album Hallel?
Toi: I remember going to an MBD concert as a child only a few months after he lost his mother (he was still in the year) and he said he’s written a new song about her called Memories and he sang it to us for the first time ever. You can bet it was hartzig. He cried as he sang it and many people cried with him.
It all depends on knowing the background to a song. Eg the famous ani maamin composed in the cattle train to Auschwitz. Or Lo Amus Ki Echye, knowing MBD sang it at the bedside of a kid with cancer.