This is Schubert's Ave Maria played as a guitar duet which works remarkably well. The score on site is for voice and guitar but the guitar duet version is also available on site.
The Last Rose of Summer is set to a traditional tune called "Aislean an Oigfear", or "The Young Man's Dream". The poem and the tune together were published in December 1813 in volume 5 of Thomas Moore's A Selection of Irish Melodies. The guitar accompaniment is my arrangement of the song and is not difficult to play but each verse is set differently to enhance the poetry. I recorded this and two other Irish songs with the splendid baritone Michael Hickman and you can find them all on YouTube.