This collection does contain 21 tracks culled from their 4 albums and includes their top 100 hits only omitting "Good Morning Starshine" which can be found on the import CD of the same name and the much cheaper budget compilation entitled "Incense and Peppermints" anyway (the name of the compilation taken from track 1 on this CD) which are both available here at Amazon.com.  The 8:26 version of "World's On Fire" is a masterpiece and it alone makes it worth buying this CD.