This Ten Years After release completely escaped me when originally released in 2012. The disc contains 2 versions of this classic album. First is the original 1971 stereo mix in its 2004 remastering. No complaints there. Tracks 11-20 are stereo mix downs of the 1973 Quadrophonic version of "A Space In Time." I wasn't sure how I felt about quad when it came around in the 70s but it wasn't around long enough to even give me pause to think. However, listening to these distinctive versions of this classic album I am glad that someone has taken the time to lay out the two versions of the LP on this single disc. Some might say single mixes should be included as bonus tracks rather than 75 minutes 41 seconds, the total run time of the disc. Normally I would agree with them, but after several careful listens, the 1971 stereo mix and the 1973 quad mix are quite different and both deserve their place in the TYA catalog. This disc is available, inexpensively, and it evaded me in 2012, glad I happened to notice the track listing. What an interesting addition to the Ten Years After catalog!