The Alberti bass is a style which simply breaks up any 3-note chord into a pattern consisting of bottom note, top note, middle note, top note, and repeat. Watch this short video and you’ll instantly understand how to apply it to most any song:

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”