Our director bought this series for our worship team back in the 90's. It was fun to do the exercises together. It was good to have solid tools to help us individually and as a group to sound the best we could each time we ministered. The coaching brought up the technical ability of folks who hadn't had much vocal training even while it sharpened the skills of those who had received previous training. It's years later now and I'm part of a different team. However, I still remind myself to hum in warming up, sigh to stretch my range, and breathe deeply, including the expansion of my back during the process, both for warm ups and for times of ministry. And best of all I still have fun doing a siren or two before I sing! I highly recommend this series to any music director desiring to raise the technical skill of their choirs or teams.