Thursday Morning Riddle

I am read for the course, but I’m blue for the test;
Take the music from musicals, I am the rest;
I’m reserving a table or signing a guest;
And to enter a charge that completes the arrest.

Who am I?

UPDATE: Riddle solved by Benjamin Baxter. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Benjamin Baxter Says:

    Book.

  2. Bill Says:

    BOOK is correct. Way to go, Benjamin Baxter!

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