Tell me about Dan Purple

It seems there might be a small error in the name you've provided, as there is no well-known figure specifically named Dan Purple in popular culture or history. However, if you were referring to "Deep Purple," the legendary rock band known for their contributions to the genre of hard rock and heavy metal, I’d be glad to provide information about them instead. Deep Purple was formed in 1968 and is renowned for hits such as "Smoke on the Water," "Highway Star," and "Child in Time." They are considered one of the pioneers of modern rock music, and their distinctive sound is characterized by the use of powerful guitar riffs, remarkable keyboards, and dynamic vocals. If you meant someone else, like a character from a show, an author, or someone less widely known, please provide more context, and I'll do my best to help!