taylor and carol king's 50 year friendship and professional partnership have had an impact on american music. now on this exclusive joint interview recorded for the new cnn film "carol king and james taylor: just call out my name," the music icons share the story behind one of their most famous songs. here's a look. ♪ you've got a friend ♪ >> it's one of those songs that writes itself really fast. >> right. >> you know, as soon as i heard it, man, that's just -- that's just it. that's a great, great song. peter sort of asking, you know, we want to put this on the album. what do you think? and you were generous enough to say sure. this fantastic tune she's recording herself, and she allows me to have the first shot at it. ♪ all you've got to do is call ♪ >> hearing your rendition of it for the first time, it was like,