Playing “Away In a Manger” On The Piano is easy, since it only uses three chords — the primary chords of I, IV and V. By using just two techniques - an Alberti bass and an ostinato — we can make a simple yet pleasant arrangement of it on the piano. Watch this short video:

How To Play Beautiful Christmas Carols On The Piano

Alberti was a composer around 1730 or so, and used this style so much that it was eventually named after him. Mozart and many other composers use his style:

The Alberti Bass Style on “Angels We Have Heard On High”