"I Found a Boy" (originally titled "Stand By Me") is a song by Adele, released as a bonus track on various editions of her second studio album, 21. The song was written solely by Adele and produced by Rick Rubin.
The song is speculated to be about Adele anonymous ex-boyfriend who inspired 21, but Adele has never discussed the true inspiration of writing the song. According to Musicnotes.com, "I Found a Boy" was written in the key of A Major. 
The song was written during her An Evening with Adele tour, as she performed the song on various occasions during the tour (it was titled "Stand By Me" at this point). 
I thought I told you, he'd be home soon Couldn't help myself, you're too good to be true. I fall short each time, Every time he ain't here You and your charm creep closer Closer in here Like a fool for fire I fall, with my pride and all. Like a bomb before explosion, Ticking by your call, You're the wiser one, disguised from greed, And I'm just a child who belongs on her knees.
But I found a boy who I love more, Than I ever did you before, So stand beside the river I cried, And lay yourself down. Look how you want me now that I don't need you.
So, you thought that I'd crumble to my knees At the first sight of you crawling back to me To whisper "will you leave your man? " You sweared that this time you can stand by me. I won't stand by you.
Cause I found a boy who I love more, Than I ever did you before, So stand beside the river I cried And lay yourself down. Look how you want me now that I don't need you!
I ain't yours for no taking, You must be mistaken I could never look into your eyes, and settle for wrong And ignore the right
Well I found a boy who loves me more, Than you ever did me before. So stand beside the river you cried And let yourself down! Look how you want me now that I don't need you!