. >> jimmy: and mark ronson -- >> mark ronson wrote the music, i wrote the lyrics. >> jimmy: andrew wyatt'm just ken." >> jimmy: so you wrote the lyrics, it's called -- it's about pop-tarts. it's called "sweet morning heat." >> yeah. [ laughter ] >> jimmy: so, some of the lyrics are, "please give me that sweet morning heat, every single day of the week, you got all the loving i need, give me that sweet morning heat." [ laughter ] >> it's love song, it's a love song. [ laughter ] you sent me the thing. and you go, anyone you think if you want to do by yourself, you wanna duet? i go, i just worked with meghan trainor, she was the best. >> yeah. >> jimmy: maybe she would want to do it. >> love meghan trainor. >> jimmy: and so i call -- i texted meghan trainor, she's like, i'm in. let's do it. i go, we're doing the pop-tart song. so we did "sweet morning heat" -- >> as a duet. >> jimmy: as a duet. >> jimmy fallon and meghan trainor together. >> jimmy: i want to play it for you tonight. just a little bit so you can hear. >> play a little bit. >> jimmy: just a little bit. [ cheers and applause