It would be interesting to know what is the most universally recognised. Some of those listed so far relate perhaps to people of a cerain generation, others more to do with musical taste, while others are more cross-generation and taste - but which most unibversal?
For me, it has to go to the Beatles - so many of their songs are instantly recognisable within the first few seconds, but I’ll nominate I Feel Fine for that wonderful bit of feedback that opens the song recording.
Focus - Hocus Pocus
Steely Dan - Rikki Don’t Lose That Number
Santana - Samba Pati
Jeff Beck/Stevie Wonder - Superstition
Temptations - Papa was a Rollin’ Stone
I’m going to plump for Black Sabbath playing Black Sabbath their first track from their eponymous debut album and Whole Lotta Love from Led Zeppelin, 'natch.