13 Heaviest Riffs of the 1960s

Here is a list of some of the heaviest riffs and songs of the 1960s, when modern rock was invented. You may not think of all these as being 'heavy' but without them we wouldn't have the rock, metal and grunge sounds that we have today. It's also important to note the influence of The Kinks, a band that could be classed as both 'proto-punk' and 'proto-metal' at the same time. What other riffs should I have included?
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TRACKS
0:02 The Kinks - All Day And All Of The Night
0:17 Pink Floyd - Interstellar Overdrive
0:45 Steppenwolf - Born To Be Wild
1:05 Cream - I Feel Free
1:32 Jimi Hendrix - Spanish Castle Magic
1:54 Neil Young - Cinnamon Girl
2:14 The Stooges - Wanna Be Your Dog
2:39 MC5 - Kick Out The Jams
2:59 King Crimson - 21st Century Schizoid Man
3:19 Led Zeppelin - Dazed And Confused
3:38 Pink Floyd - The Nile Song
4:00 Led Zeppelin - Bring It On Home
4:21 The Beatles - Helter Skelter