I too have never heard the term "Symphony Bush". The largest and most fragrant Datura is D. suaveolens ( sweet-smelling) it is a large and large leaved bush which produces many enormous trumpet-shaped white flowers (a symphony of flowers??). My guess is it is this. It is only suitable in a tropical climate, however.

Thank you, I never figured anyone would ever post on this thread! Maby it's an outdated term referring to daturas. I guess some people are just unaware of scientific names and only stick to common ones. lol