This is a really interesting and beautiful arrangement of O Holy night, perfect for concert settings. I arranged it for solo voice (in treble clef) with piano accompaniment. It includes 2 verses, and the piano accompaniment is very mellifluous and contrapuntal, which adds the right amount of complexity to this Christmas classic. This definitely isn't your grandma's arrangement! (Although she would absolutely love it)

The Christmas hymn, O Come O Come Emmanuel, is a lovely piece using minor keys. I've always wanted to do an arrangement of it for a solo performance.
This piece is fairly simple and would work on piano or organ. The vocal range would be second soprano to first alto range, or suitable for baritone or tenor by moving the melody down an octave.

Lyrics:
O come, O come, Emmanuel, and ransom captive Israel
That mourns in lonely exile here until the son of God appear.

Chorus:
Rejoice! Rejoice! Emmanuel shall come to thee, O Israel.

O come, thou rod of Jesse, free thine own from Satan's tyranny.
From depths of hell they people save, and give them vict'ry o'er the grave.

O come, O Dayspring, come and cheer our spirits by thine advent here,
And drive away the shades of night, and pierce the clouds and bring us light.