Black Sabbath - Megalomania (bass cover + tabs in description) 

What a beast of a song!
Now I have to say, those first 3 minutes seem like they drag, but when the bassline is this involved you don't really feel it being so long. And then when the riff kicks in, oh boy! Instant reward!
You might think that by the end of the video I played some notes off-key and messed up the ending. But to be honest, that's not really the case. I've listened to this ending many times to figure it out and it seems like Geezer also plays a few notes off-key and the ending is a complete shitshow. Other than that, the song is bangin'! One of Sabbath's most underrated songs. Those screams from Ozzy, what the hell :D
Tabs (GP + PDF): drive.google.c...
The song is from Black Sabbath's sixth album - Sabotage, released in 1975.