There is a fantastically simple and lo-fi keyboard intro to Holiday Heart which belies the incredible sophistication of its production. The track builds in layers as it progresses becoming increasingly richer in sounds before taking you back to simplicity before building again.
Ki:Theory is the solo moniker of producer Joel Burleson who has remixed Daft Punk and Kings Of Leon as well as others.
Holiday Heart is available for free download from the Ki:Theory website (link attached). In fact the entire original catalogue of Ki:Theory is available on the site and there's a link to make donations through paypal to show your appreciation.