One of the new features in Band-in-a-Box 2015 for Mac is the Big Piano Window. Watch the YouTube Video to see it in action: https://youtu.be/UPMW7W-_9Kw

The Big Piano Window displays notes on a resizable keyboard while the song is playing with Band-in-a-Box.
To learn more about all the new features included in Band-in-a-Box 2015 for Mac, visit http://www.pgmusic.com/bbmac.new.htm