Tens of thousands of music fans flocked to Philadelphia this Labor Day weekend for Budweiser’s patriotic “Made In America” festival, where a star studded line-up of musicians, from Beyoncé to De La Soul, took center stage. The explosion of live music spilling on to the Benjamin Franklin parkway, a mixture of iconic voices, electric beats and a roaring crowd, made for an unforgettable outdoor concert experience– but it was the sounds the audience could not hear, a flurry of tones too low for the human ear to detect, that set this year’s festival apart.
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