This is comprehensive and updated. Excellent as my title says for classical, jazz, band, and some electronic compositions. For music editors fantastic. I should say it is good for pop IF it is piano accompaniment with lyrics or a band with singer (not using lead sheets).
As one reviewer wrote do not spend the money if you do not write orchestral or large band music. If your medium of composition is piano, chamber works, writing lead sheets, or straightforward choral works, Sibelius notation software offers INDIRECTLY through its instruction manual good thorough basics on notation. If you want a direct manual Dover has issued a Norton Guide to notation.
But if you are a composer who write or intends to write for large forces or works with a great deal of chromaticism, meter changes, use of more complex rhythms, and some extended techniques, PLEASE get this book. A tidy, well-laid out score will significantly increase your chances performers will review your arrangements and/or compositions. I guarantee that they will play it better than if you present a carelessly prepared score.