Lovely Joan is an English folk tune. This guitar arrangement of it is very short, so it's worth repeating the song to extend its time. Lovely Joan is a Dorian mode melody meaning it's similar to being in a minor key except that the 6th scale note is raised a semitone (F# instead of F in this case). Keep it light and flowing and bring out the melody. The time signature is a simple 4/4 and you should play the song with a slow-moderate tempo and bring out the vocal quality of the melody.
Listen to Lovely Joan
Here's the audio version of the score that you can follow page by page on the video screen.