todd williams is burning up on the drums. miles comes to his solo. at the peak of this solo, i play a court -- chord that was so wrong. i thought i had lit a match to the whole thing and burned to the ground. i did not know what to do. miles took a breath and played some notes that made my chord right. [laughter] i could not believe what i heard. he made it to fit somehow. what is see, some kind of alchemist? merlin the magician. it took me years to figure out what happened. what happened was miles did not judge what he had played. he just heard it and said, that is interesting. and then he found some notes to make it work right. tavis: was there ever a conversation after the show? >> afterwards, i said, how did you do that? he just shrugged his shoulders. he said, do what? [laughter] tavis: that sounds like miles. it is hard to imagine -- i'm always happy to have you on the show. they said, herbie hancock is about to go on to work. this -- tour. but this is the first ever solo tour? >> i did a short 24. just acoustic piano. this one is acoustic pian

we have the william todd university professor in the public of affairs in the department of psychologye woodrow wilson school of public and international affairs at princeton university. i suspect you don't have a card. [laughter] >> it would be very long if you did. his research focuses on human decision-making and it's at the intersection of sicoli and behavior economics even before there was such a thing called behavior economics and recently his work on decision-making has been put to good use in trying to understand the problem of probability. how to apply behavioral to policy. and his ideas 42 if i understand correctly is sort of a think tank that uses behavioral science that uses real world problems such as how poor people can get access to financial institutions, how people should choose health care coverage, how to improve educational opportunities in low-incomed communities et cetera. so a great pleasure to have him sitting beside me and a great pleasure to not have to talk after him. and we have a research professor at harvard university. before that, he taught in the law sc