OK it seems exactly what I thought and described, and the opposite of what the parent poster described. The parent poster said that if you want to use the cover

OK it seems exactly what I thought and described, and the opposite of what the parent poster described. The parent poster said that if you want to use the cover of the song you need to negotiate with both the people who did the cover and the original rights owner. The closest I could get to a situation like that would be if I told Band B do a cover of Song A for my movie and I paid the licensing costs as part of my deal with Band B, but still not the same as the parent poster's description.