Here is an arrangement of Greensleeves I did back when I was teaching guitar full time.  The arrangement was meant for intermediate to advanced students, and is both a little challenging and fun to play.  Greensleeves (a/k/a What Child is This?) is often thought of as a Christmas classic, but the song actually originated as a love ballad in late 1500’s England.  The tune quickly became a staple of popular culture, even to the point of Shakespeare seeming to have a bit of fun with the song’s widespread prevalence in The Merry Wives of Windsor.  And the tune remains well known, even to this day.  Hope you enjoy.

“Let the sky rain potatoes, let it thunder to the tune of ‘Greensleeves’…”
    — William Shakespeare, via Falstaff, The Merry Wives of Windsor (Act V, Scene 5)