There's nothing quite like a tailgate, where fans serve food to strangers who share the same passion. We went to a Philadelphia Eagles tailgate to learn what drives this uniquely American tradition.

THE WEEK’S MOST POPULAR CURRENT ALTERNATIVE SONGS ACROSS ALL GENRES, RANKED BY STREAMING ACTIVITY DATA BY ONLINE MUSIC SOURCES TRACKED BY LUMINATE, RADIO AIRPLAY AUDIENCE IMPRESSIONS AS MEAURED ...