By using the Alberti bass high on the keyboard to make a light, airy-like sound in the first part of the song, then using octave bass runs in the left hand in the 2nd part of the song, we can create some good contrast that makes for an interesting arrangement of “Angels We Have Heard On High”. Watch this short video on this classic Christmas Carol:

The Alberti bass is just one style out of scores you can use in your piano playing. For a full course in applying various styles please see How To Dress Up “Naked Music” 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”