Okay, well we all know "Rock around the Clock" was used as the primary theme song for the first two seasons of the show. Beginning with Season 3, we heard for the remainder of the series, the traditional "Happy Days" theme song. Each season, we got a new arrangement of the theme. But for seasons 5 and 10, it was the theme that was used from the previous seasons (4 & 9). Here's my question: There are two episodes from Season 5 that have a different arrangement than what was used for the rest of that season's episodes. Was there indeed a different version for this season on it's original airing on ABC and for syndication, they edited in the Season 4 music for all the episodes? If so, why would they do that? Did they indeed do this for Season 10, also?