The first quarter of the 21st century featured 327 No. 1 Billboard Hot 100 hits seemingly covering every topic imaginable.

Chart-toppers in that span ranged from “We Belong Together” to “We Are Never Ever Getting Back Together.” From “Bootylicious” to “Way 2 Sexy,” “Angel” to “Vampire.”

“Butterfly” and “Fireflies” both winged their way to No. 1. So did such explosive hits such as as “Firework” and (directly after) “Grenade.” For every “Party Rock Anthem,” there was “A Bar Song” to sing along to (probably loudly if while tipsy).

Meanwhile, no matter where music fans were, or any loyalties, we bopped to “Empire State of Mind” and “California Gurls” and everything in between.

The creators of those hits encompass nearly 1,000 credited songwriters (along with more than 300 producers). Some

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