This is simply an arrangement of the "Love is Here to Stay" written by George and Ira Gershwin.  Actually it was begun by George and Ira and later completed by Duke Jordan, with the assistance of Oscar Levant, working from the sketches left by George.  Gene Kelly sang this song in the 1951 musical file "An American in Paris".  I am not a great pianist but the pieces are not about performance as much as sample quality and to give users an idea of some of the great piano samples available. 

Demo B - Love is Here to Stay.  4Front's TruePianos Diamond module using the Jazz preset listen as the piano sings this Gershwin tune 

The TruePianos interface is very cool also here is a screenshot of piano playing this piece:

Demo B - Love is Here to Stay.  Post Piano Bosendorfer 290 Patch Dry 16 Layers

Demo B - Love is Here to Stay.  William Coakley Hamburg D359 Piano

As requested by many users here is Midi File for this demo 'Love is Here to Stay'.