The YouTube link should be cued up to the proper spot.

I have heard that song I have no idea how many times, but I never noticed. It’s one of my favorite Pink Floyd songs too.

The tune also quotes Delia Derbyshire’s realisation of Ron Grainer’s Doctor Who theme music from the British science fiction television series Doctor Who.[12][13][unreliable source?] This quotation is most clear in live performances.[14]

https://en.wikipedia.org/wiki/One_of_These_Days_(instrumental)

And it really wasn’t a coincidence:

“Embryo” was the first Pink Floyd song to contain an excerpt of the theme, appearing in live performances in 1971, although in “Embryo” only the first two bars of the theme would play, as opposed to a much longer segment in “Cymbaline”. Oddly, these two songs were often performed at the same concerts. “One of These Days”, the opening track of Pink Floyd’s 1971 album Meddle, echoes the theme about 3 minutes into the track. The reference was made more explicit in live performances.[16] In addition, their song “Sheep” has a bassline very similar to the theme song’s bassline and the opening 3 notes of the main theme are played at 06.47, whilst live performances featured a much longer excerpt of the theme.

https://en.wikipedia.org/wiki/Doctor_Who_theme_music#Remixes_and_remakes