Summer reading. I'm not sure of the why-and-what for the popular association between reading and summer. Vacation. Leisure. Perhaps that's it.
But if you're a piano lover and looking to do some reading, you might give consideration to James Barron's "Piano: The Making of a Steinway Concert Grand" out just this month. Here's the amazon.com link .
Until then, there's always Ms. Marple.
Or The Piano Man in Love comic series.