The foundations of the modern Yamaha company were laid in 1887 by Torakusu Yamaha when he established the Nippon Gakki Company Limited, Back then they only produced pianos and organs. The company's musical heritage is clearly represented even today by the famous tuning fork logo.
It wasn't until after WW2 that they put the mechanical skills learnt during the war time years to motorcycle production use and the Yamaha Motor Company was formed.
Since then they have grown as giants in the world of musical instruments and haven't done too bad with bikes!
There have been too many iconic road bikes that have worn the famous the logo to mention in a brief introduction from the FS1-E to the mighty YZF-R1. Yamaha have always been a company keen to display it's abilities on the race track and been responsible for so many memorable race bikes.
Fortunately they are still making great road and race bikes alike both on and off road and GPR do exhausts for a great many of them. We can't help you make your piano sound any better though! Maybe JT got the wrong contract....