Hey You (Pink Floyd) & The Call Of Ktulu (Metallica) 1979 & 1984

Just a similarity between the openings of Pink Floyd's song "Hey You", from their 1979 album "The Wall" and Metallica's instrumental song "The Call Of Ktulu" from their 1984 album "Ride The Lightning".
Note: this similarity was first noticed by someone else, but I couldn't find that video, so I made this one.
All credits to them.

[@andrewshiely1794]

Goodbye blue sky has a riff very similar to that of fade to black as well