FOR FANS OF early music — an often scholarly lot who aren’t afraid to wear their hearts on their sleeves — bad-boy Baroque-era painter Caravaggio certainly nailed something in his dramatic 1595 painting, “The Musicians.” (Simon Schama talks about this in his TV series The Power of Art.) One look at his masterpiece, and you feel as if you’ve stumbled upon and surprised a roomful of dewy-eyed musicians, their youthful faces swollen with melancholy, with the lutist looking like he’s about ready to burst into tears before he’s even tuned his instrument. So no, you certainly don’t need a Ph.D. to enjoy and be moved by the music of Handel, G.P. Telemann, or J.S. Bach, but a little bit of scholarship never hurt anyone. Knowing the history of this music may even deepen your appreciation of it.