Watch the Karen online guitar lesson by Adrian Legg from Fingerstyle Revisionist: Adagio Songbook
This piece, called "Karen", is named after Karen Carpenter, who I'm a fan of. She did things that were considered pop that I actually grew up with, using 50's pop song structures (1-6-4-5). I unconsciously absorbed a good deal of these songs, so I've tried to write a lot of this kind of thing for guitar. It hit me one day, by dropping the fifth string down to G you can get an open structure with a good range of 6ths up the fretboard that makes it more accessible.
This song is fairly easy to play and understand, but it does have a few tricky parts that you'll learn by spending time with it.