"For once, a CD lives up to its title. The Essential collection is culled from the Orthacoustic transcriptions, featuring perhaps the best lineup in Sons history performing just about every song in the Nolan/Spencer/Spencer songbooks written to that point. Obviously, this collection doesn't have them all--there were somewhere around 200 recorded--but it does contain some really great tunes. I can't say some of the best, because they were all good!See also: Symphonies of the Sage, also from Soundies. It has some unfortunate overlap with this set (it came out first, and Soundies probably felt the overlapping tunes couldn't be left off of this collection and still call it "essential"), but the unique tunes are well worth your consideration."