"Heart of Worship" is apparently a series of releases which contain music written by various artists. They are performed by various performers for the purpose of the series, so they are more likely albums than compilations.
Unfortunately, there does not seem to be much of any information on the performers for the releases and their individual tracks. If the information is known by anyone, the releases should be moved to Various Artists and the track artists assigned to the performers.
More information is available at http://wholeworldmusic.com/heartofworship.htm