Evangelical Lutheran Worship (Augsburg Fortress). I would bundle this latest Lutheran hymnal with its earlier iterations, the most important being The Lutheran Hymnal of 1941, as well as The Daily Office, published in 1965.
The New Measures: A Theological History of Democratic Practice
Not long ago the New York Times carried a story about a California congregation that maintains three separate bands: one specializing in soft rock, one in hard rock and one in classic rock. It effectively recruits its members, all 8,000 of them, according to their taste in Christian rock music.