What makes a song worthy of singing along? Have you ever been in a crowd when complete strangers ended up singing together? Whether it's the fans at an athletic event belting out a line ("Nah-nah-nah-nah, Nah-nah-nah-nah, hey, hey, heyyyy, gooooodbye."), people at a pub crooning along to Lean on Me or the entire Olympic stadium joining a performance of Hey Jude, you can probably remember a time when you (or the people you were with) got swept into a popular song. Alisun Pawley observed ...

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