guitarist whose massive success rests on the rock of his songcraft and soulful voice, authentic as an unmade doing? >> yeah, i'm good, i'm good. i'm in l.a. so i'm staying inside trying not to get sunburnt. ♪ happy there >> reporter: with that pale skin, red hair and glasses, the 27-year-old english troubadour is the subject of "songwriter," a film from his cousin marie cummings that documents the divine. >> having my back to the wall, observe what's happening, let it happen, film everything. ♪ baby i am dancing in the dark ♪ >> reporter: his 2017 album that spawned such hits as "perfect." ♪ i'm in love with the shape of you push and pull like a magnet do ♪ >> reporter: "the shape of you." while sheeran has spent the summer playing stadiums, the documentary puts the emphasis on his ability to craft intimate songs. the power to enthrall young hearts. ♪ >> what kind of emotions can you express in a song that you find it challenging to express in real life? >> the best songs are the most truthful and honest songs because it's stuff you can't actually say yourself. ♪ i whispered underneath my br