In addition to a solidly written query letter many literary houses also request a synopsis of your novel.  The rules are simple; write in the same format used in your novel, use third person present tense, keep it to a few pages, limit dialogue and detailed explanation of every character, keep the tone of your synopsis the same as your novel, no editorial comments and make the ending complete.   As with other earlier posts it should be obvious I use music as a creative muse to write, to gain ideas and to inspire/motivate.  You can use your muse to write your synopsis because everyone needs inspiration to get the job done. LA Carlson