Forgot to say, the name Mannheim Steamroller is a reference to the classical term Mannheim Rocket, so that means they’ve at least had some classical training.
Am familiar with the term Mannheim Rocket courtesy of my daughter-in-law. One of her degrees from Baylor is in music. They play music in their home 24/7 and all kinds except for true western and rap. Everyone in their family plays several instruments for pleasure only. Been interesting for my son who grew up in a CW and jazz only household.