coming up, our conversation with patty griffin. griffin's mostly lyrical style is called americana, but there is the range of heafter w. to aa gospel cd, she went personal album entitled "american kid," which she dedicates to her father, who died. here is a tribute to the underground railroad. she sings this with her partner, robert plant. ♪ tavis: tell me more about how that track came to be. >> i got asked to write a song for a friend of mine producing a young band, and he was looking for songs for them. that this sort of a groove i had been working on, and i thought i would just write a song around it for them. i thought it would be right for them, but they did not dig it. tavis: yes. >> oh i had it, and i decided to keep it. tavis: i am glad you did. it is a nice tribute. so how does it feel how do you process, how did you not take personally being asked to write something for someone, in you write it, and they do not feel it? i guess it is not a personal thing if they do not like it. you write a song, and they say, "thank you,

patty griffin. tomorrow night, craig ferguson will be here. but "jimmy fallon" happening right now.pplause ] ♪ >> steve: from studio 6b in rockefeller center, the national broadcasting company presents -- tonight's guests are -- and featuring the legendary roots crew. and here he is -- jimmy fallon! [ cheers and applause ] captions paid for by nbc-universal television -- captions by vitac -- www.vitac.com ♪ [ cheers and applause ] >> jimmy: welcome, everybody! thank you so much for being here! and welcome to our show. welcome to "late night with jimmy fallon." you guys feeling good tonight?! [ cheers and applause ] that's fantastic. well, welcome, we have a great show. >> audience member: i love you, jimmy! >> jimmy: i love you, too. let's get to some jokes here. here's what people are talking about. today, president obama and joe biden met with south korean president park geun-hye, who is known as south korea's iron lady. [ scattered laughter ] or as biden put it, "can you introduce me to iron man? because i love -- i'm a big fan." biden gave advice on how to avoid war with north k