Neil Gaiman's asking his twitter followers to choose their perfect pop songs. He suggested Be My Baby, It's My Party and I'll Cry if I Want To, and Stand By Me. All of which are instantly recognisable (to me anyway because I'm old), hummable, and stand up to repeated listenings.
My choices, this afternoon anyway, would be Bring It On Home to Me by Sam Cooke.
Ray of Light by Madonna.
Teenage Kicks by The Undertones.