late ♪ though we really did try to make it. >> james, we have a problem. >> we have a problem here in that we have an embarrassment of riches. she wrote too many good songs. >> as did he. >> reporter: the tour marked the relationship. we couldn't ask for more. >> we shared our music with every band member, singer, crew member, and everybody has the same treasure. >> reporter: and offered up a celebration of one of the most prolific partnerships in american music history. >> when you left that concert, it made you realize what exactly they contributed to american music over the decades. >> reporter: bill weir, cnn new york. >> "just call out my name" airs this weekend on sunday at 9:00