More than a century before rap exploded o nto the American music scene, West African musicians were telling stories rhythmically, with just the beat of a drum for accompaniment. Meanwhile, folk artists from the Caribbean Islands were also telling stories in rhyme. Indeed, these singing poets from Africa and the Caribbean lay the foundation for modern-day American rap music.

Rapping essentially involves the speaking or chanting of rhyming lyrics, often set to a beat. The rhyming created by rappers is considered by many to be o ne of the most sophisticated styles of poetry. What's more, these rhymes often address provocative subjects such as sex, violence and socio-political issues.

Rapping first gained popularity in the U.S. in the 1970s as a kind of street art, especially among African-American teenagers. But it wasn't until 1979 […] that record producers took notice of this emerging musical genre. O nce they did, numerous rap acts surfaced, and rap's audience began to swell. It wasn't just African-American male rappers getting in o n the act, either: by the 1980s, white rap bands […] and female rap […] bands were reaching the top of the charts.

By the 1990s, rap matured from an old-schoolstyle – which was based o n relatively simple lyrics – to a new-school-style, which was louder and included more complex lyrics. Artists such as The Notorious B.I.G., Snoop Dogg and Tupac ruled the charts during this time, as did Eminem – o ne of the most popular white rappers of all time.

Rap has stood the test of time and its popularity rages o n with today's artists such as 50 Cent, Ludacris and Jay-Z churning out hit after thoughtprovoking hit. The beat truly does go on.

The lead single from P!nk's seventh album, Beautiful Trauma, paints a grim picture of a broken America. The lyrics are just vague enough to be a pop anthem that can apply to any sort of injustice. But then New Jersey Governor Chris Christie's keynote speech at the Republican National Convention plays at the beginning of the music video, and the song's rallying cry against “broken promises” seems to zero in on the current administration.