Over the past decade, Maroon 5 has morphed into one of the most reliable hitmaking graoups on the planet, with a slew of inescapable radio smashes spread over the course of four full-length albums. Although the Adam Levine-led collective has unleashed its biggest Hot 100 hits over the past two years, its mid-00s run of singles -- with tracks as diverse as the hard-hitting "Harder To Breathe" and the somber "She Will Be Loved" -- was equally impressive, and is key to understanding what exactly makes Maroon 5 an ascendent band in the pop genre.