Ludovico Einaudi - Divenire

A piece that builds from a simple piano chord sequence to a swirling hive of activity.

Ludovico Einaudi is particularly famous for his pared-down piano tunes, but this piece expands his trademark soundscape to include a string orchestra. 

The melody may start out as a simple, repetitive four-chord sequence - but the piece gradually builds from almost nothing into a busy hive of swirling musical activity. 

It's the title track from the composer/pianist's 2006 album, with each piece demonstrating his ability to compose utterly simple yet beguiling melodies.