From the wiki:
"You Really Got Me" was an early hit song built around power chords (perfect fifths and octaves),[5] and heavily influenced later rock musicians, particularly in the sub-genres heavy metal and punk rock.[2] American musicologist Robert Walser wrote that it is "the first hit song built around power chords"[5] while critic Denise Sullivan of Allmusic writes, "'You Really Got Me' remains a blueprint song in the hard rock and heavy metal arsenal."[6]