At Proclaim and Defend, there is a three (3) part article examining Sovereign Grace Music from Sovereign Grace Ministries compared with Getty-Townend Music at:
http://www.proclaimanddefend.org/2012/12/11/an-examination-of-sovereign-grace-ministries-and-getty-townend-for-use-in-fundamental-christian-churches-1/
http://www.proclaimanddefend.org/2012/12/19/an-examination-of-sovereign-grace-ministries-and-getty-townend-for-use-in-fundamental-christian-churches-2/
http://www.proclaimanddefend.org/2012/12/27/an-examination-of-sovereign-grace-ministries-and-getty-townend-for-use-in-fundamental-christian-churches-3/
Followed by David Cloud's, http://www.wayoflife.org, reviews here in the free e-book below, wherein the Gettys (page 139-140) and Townend (page 360) are reviewed with a similar but somewhat different take. Unfortunately, Cloud has nothing to say about SGM (yet). Knowing Cloud, he will soon enough have good reason to take them on too.
http://www.wayoflife.org/free_ebooks/downloads/Directory_of_Contemporary_Worship_Musicians.pdf
