With their polished blend of dance-rock and neo-soul, Maroon 5 and frontman Adam Levine navigate shifting trends in music and fashion to be one of the biggest pop bands of their generation. They took the long way to the top, evolving from the straight-ahead '90s rock band Kara's Flowers into the sleek, soulful Maroon 5 with 2002's Songs About Jane, an album that languished for two years until "This Love" climbed to number five on Billboard's Hot 100 in 2004. From that point forward, the group was a fixture at the top of the charts, their popularity receiving a considerable and...