charlie puth swang top artists like megan trainor. he co-created the number one hit that spawned one of the most watched youtube videos of all time. tonight he tells his story of how he did it of the. >> it is just minutes to show type for up and coming star charlie puth. >> the fans are already inside. they're in their seats. >> he is technically the opener but for soap in this packed arena in washington, d.c., charlie is why they're here. he's been drumming up some major attention, topping charts with plenty of solo hits. he first skyrocketed to fame after co-creating one of the most successful musical corroborations in music history. ♪ it's been a long day without you my friend ♪ >> see you again, honoring the late paul walker. ♪ see you again >> the most viewed music video on youtube for nearly a month and scoring three grammy nominations. he composed thor lyrics during a meeting. he said it took only a matter of minutes. >> my friend passed away in 2012. the moment i found out he was no longer living. i texted his friend. i was l

listening to "lips are moving" by our pal megan trainor. >> good morning. >> good morning. >> what'stten a note to her. >> in the mail. >> when i was -- >> stamped. >> and i was doing a little -- >> don't want to show my address. >> yes. >> but what's the post mark on it? >> the post mark is from france. >> what's the date? >> august 17th. >> no, no, oh, wait. >> august 30th. >> august 30th. >> you can see my confusion. >> it's not 2030. august 30th, 2017. >> what is today? >> today is the 17th. >> the 19th of september. >> but i got it yesterday. >> mail travels slowly from france. >> no, no. you don't check your mail, and that's why you check your mail. i purposefully wrote that letter to see how long it would take for you to get the letter. >> but it's so outdated now that i read it. >> well, guess why. >> it was a very nice letter thanking me for the work i did with harvey because al was taking leila to school. >> i was taking her to college and sheep's out there a long time, a nursing mom and all that stuff. >> and then he went on to say the way things are shaping up my turn in