I didn't download it but they are available in OGG as well. I don't think the quality is much different though. You might take note of what the person who shared it said about its quality:
"I have provided these cues in the hope that higher-quality versions are either soon found, remastered, or released. For now, despite the noisy analog hiss and audible panning errors (the audio appears to be heavier on the right side, yet more audible on the left), this should hope to satisfy those who have been searching."
If I might add something to this--consider that this is music that was recorded like 40-50 years ago, for a kids' cartoon. I don't think these were intentionally compressed into very bad quality; we might be listening to original quality.
Thank you for finding this, themusicalman62! It's not something I ever thought about wanting because I didn't think something like it would ever be found. I get the idea that the Wayback Machine and the Internet Archive could have more goodies like this.
The original link to the Scooby-Doo underscore is:
http://cybernight.elementfx.com/scooby.html
which has all of the .MP3s uploaded to archive.org as a ~70mb ZIP file. If I'm not mistaken, the uploader who put them on archive.org simply used this link's ZIP as the source files. Further, the .OGG files are merely *doubly-compressed* since archive.org makes, via software encoders when audio files are uploaded there, various lossy versions, including .OGG as routine.
The message that "higher-quality versions might be found" was not lost on me, *but* we're 100% for sure NOT hearing the original quality of the "lost" masters at 128-kbps MP3 quality. My point (and hope!) is that the person who did upload the underscore master recordings to the cybernight site re-thinks the decision to 'preserve' the underscore with bad-quality, artifact-ridden 128 kbit/sec MP3s, and instead will re-upload the original analogue masters and encode them properly to FLAC, which is *lossless*, and will preserve the original quality of the master tapes *without* introducing new and unwanted digital compression artifacts to that orignal analogue audio recorded 50 year ago!
I hope this makes it a little more clear.
But, I'm still appreciative that after 50 years, the orignal SD underscore recordings have been found and made available. Whether they were "leaked" or not, it is a definite win for us aficionados of the original series.