That's a whole lotta supposin' there, partner!
Former Goodson music director and present day stage manager about town, Mike Malone, was the gentleman who dubbed the original reel-to-reel Score music for MG and TPiR in the 70s. Mike personally made the razor blade edits that created the MG opening loop, as well as the other edits that make the MG main theme used on-air different from the version you have on the GSN CD.
Dubs of Mike's tapes with the edits were then dubbed again by CBS techs onto the special lubricated tape stock that was then wound into the MacKenzie "magazine" loops that were used for playback at CBS TV City well into the 80s. (Studio 33 never used the NAB broadcast cartridges that resemble 8-tracks, as alluded to by the previous poster).
Any change in pitch was unintentional, but simply the result of playing tapes recorded on other machines in the course of all the dubbing. How do I know? I asked Mike himself. He is not my bowling buddy.
And the spoken instructions to spay and neuter your pets that can be heard subliminally when you play the TPiR "Splendido" cue backwards must have been added in the 80s after Mike's tenure at Goodson!
For details on the amazing MacKenzie playback system that was revolutionary for its time before NAB carts, read
THIS excellent article.
Randy
tvrandywest.com