The CMAA is pleased to present the great book of our age on Catholic music: William Mahrt's The Musical Shape of the Liturgy. I would go further to say that nothing like this has ever appeared in print.
I know that it is rather unusual to distribute the book this way even before it is available in Kindle (next week) and in print (next month), but, in this case, the book is just too important. You will be able to buy the epub edition and the hardcopy edition soon enough. But for now, here it is. If you appreciate what the CMAA is doing, please consider supporting this work.
The Musical Shape of the Liturgy