"Mike's Groove" is a shortened title for a combination of three songs -- "Mike's Song", "I Am Hydrogen", and "Weekapaug Groove" -- played consecutively, as a suite. (This are easiest to see on the Hydrogen ETP chart.) The first live known version was 7/23/88.
Early manager John Paluska had reported (circa 1992) that these three songs would never be played independently, that Mike's Groove would always stand alone as Mike's Groove. Most tapers nonetheless continued to label the three seperately, and for good reason: Things change.
Since John's assurance, there are many examples when either something was missing (particularly Hydrogen), something else was added (especially "Simple"), or something was played independantly (especially Mike's Song). Check out the 12-31-92 with Auld Lang Syne instead of Hydrogen, the 30 minute Mike's Song on 2-20-93, the Mike's Man Who Stepped Into Alvenu Groove stretch, the 11/30/94 Ya Mar > Mike's Song > Catapult, and the three Leprechaun replacements (e.g. 7/17/93 and 7/31/93).
"With Phish, you can always expect the unexpected.""
-- Andy Smith, Providence Journal 7/12/99"