7. 'Sweet Child O' Mine' - Guns N' Roses (1988)
With a guitar riff memorable enough for an amnesiac to recall, it no surprise that this hit single - despite being credited as hard rock - is considered as one of the greatest pop songs of all time. It was the band's first and only No 1 hit, sticking at the top spot for two weeks in the US.
Sample lyrics: (All together now) "Woooah, sweet child o' mine. Wooah oh oh oh sweet love of mine".