Danny Boy is a famous ballad set to an ancient Irish melody with lyrics by English songwriter Frederic Weatherly.
For Violin and guitar duet.
Early intermediate.
With downloadable mp3's for audio help (one with both the Violin and guitar and one with guitar only).
With guitar tablature. With melody line. With lyrics.
Pages: four pages (score and Violin part)

Molly Malone (also known as Cockles and Mussels) is a traditional Irsish song.

For Violin and Guitar duet or Violin Guitar and voice.
With some finger position suggestions. With melody line and lyrics.
With standard notation and tablature. With downloadable mp3 just for audio help.

Easy to early intermediate.
Pages: Three (3) pages,   (2 pages Melody/Violin and Guitar with tab, 1 page Violin part ).

"Away in a Manger" is one of the most popular Carols. It was first published in the late nineteenth century.
Here is an arrangement for Violin and Guitar duet. With lyrics and Melody line.
With guitar standard notation and tablature.
Three pages (two pages both guitar and violin, 1 page violin)
With downloadable simple mp3 for audio help and practice the Violin.