The most complete set of reference and printed material available on Christian worship. These books provide a detailed view of Christian worship and the importance it has played in the development of the Church.
This 3rd volume in this excellent series on Worship has an awful lot of material packed into it.
I found it a fascinating look at the ways many different denomination worshipped - and whilst this is naturally very American in its approach, I still found it quite informative. Once again this does have an encyclopaedia style to it and as such there is a bit of repetition in this volume - but it would only really be noticed if you do, as I did, and read it cover-to-cover.
This volume has a wealth of articles looking at how and why worship is done, aiming to supply resources for Worship renewal. I believe it is a very worthwhile practice to see how and why other do these things - this does not mean that we have to change things - often we get, not only a better understanding about the worship in fellow denominations, but a better understanding why we do things we do.
Well worth a read for all Christians - though especially for those involved in Worship leading / organising.