(Part 2) Top products from r/worshipleaders

I'll echo several comments on this thread. Take some time to learn theory yourself. Learn to read music. If all you knew how to do was speak English but never read English you would be missing out on so much beauty. I'm not saying become a proficient sight reader but at least learn about the written language of music.

Some ways to do that are to audit a music theory class at a local college, go through the lessons at musictheory.net, or pick up an easy adult piano course book like the one below which is how I got my start learning to read music before heading to college. The piano is the best instrument to learn how theory fits together on and learning theory on the piano has made me a phenomenally better guitarist.
http://www.amazon.com/Adult-All---One-Course-Lesson-Theory-Technic/dp/0882848186/ref=sr_1_1?ie=UTF8&qid=1452649895&sr=8-1&keywords=adult+piano wh

A great place to start with these musicians is to begin using lead sheets. I've done this with several churches I've consulted with. (I'm work with a few church consulting firms helping churches transition music styles if they need to go more contemporary or blended to be more relevant to their community.) Taking an older church lady who is used to reading the block chords in hymns and using lead sheets to transition them to chord charts has worked 100% of the time. Lead sheets help them follow the count, which is what they're used too, but only gives them the melody to read. Songselect.com and praisecharts.com has all the lead sheets you'll ever need.

As a worship leader it's your responsibility not to grow complacent and learn, learn, learn as much as you can about music. Disciple these junior-high students into great church musicians. Meet them in the middle and share a common ground with them. You learn some theory and they learn some improv. Win-Win. Also, be patient.

Reaching Out Without Dumbing Down by Marva Dawn

Edit to add: actually, the very best book I've read about worship, recently, is "Worshiping with the Anaheim Vineyard: The Emergence of Contemporary Worship (The Church at Worship: Case Studies from Christian History)." This book is amazing, because it details what contemporary Christian worship music was like near the beginning of its creation, and how a church grew from zero to 3000 in five years. ...
... without...
...
... (are you sitting down?)
...
...
... words.

That is, they crafted a worship style that was not dependent upon lyric sheets, songbooks, nor overhead projection. They crafted simple songs because they were limited in doing so. But the songs sparked a revival that catapulted this small church into the worship big leagues for a number of years.

Perspectives on Christian Worship: Five Views.

If you want to understand the differences in worship ‘styles’ and practices from church to church, and between denominations this is an excellent book.

Each contributor puts forward a defence of their view which is then cross-examined by each of the others. The best way to understand a subject is by reading people debate it!

As /u/rmilkman13 said, Worship Matters by Bob Kauflin is great.

I'd also heartily recommend "Worship in Spirit and In Truth" by John Frame.

Following the River by Bob Sorge is really great. Very short and simply points to the biblical vision of corporate worship

​

https://www.amazon.com/Following-River-Vision-Corporate-Worship/dp/0970479166

Bob Kauflin is the man! If you're looking for a more "general" study of worship that extends beyond music, leading, etc his other book, "True Worshipers" is a great read.

I really recommend Real Worship by Warren Wiersbe!