At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
Sir Walter Raleigh. http://www.notablebiographies.com/Pu-Ro/Raleigh-Walter.html#b
Unknown to many people, Robert Ingersoll was a very important figure that even the likes of Mark Twain admired. He held radical views against slavery and advocated women's rights. I would say that his realistic style was comparative to popular figures such as John Stuart Mill, John Locke, Jean-Jacques Rousseau and Voltaire (François-Marie Arouet).
- and of course, to write about him is know be knowledgeable of the political environment during his time.
Francis Drake was a slave trader ☹
Bach and Beethoven are always options:) it really depends on what you're writing for/are interested in. Or you could choose: Isaac Newton, Johann Kepler, Blaise Pascal, Robert Boyle, Michael Faraday, etc.