In the years between Big Time Rush's second and third album, a boy band explosion went off. So the made-for-Nickelodeon band seems to be trying to set itself apart by emphasizing its ... Nickelodeon-ness. Gone are the funkiness and hip-hop cameos of Elevate; these boys don't touch the up-all-night clubbiness of their new colleagues either. Instead, 24/Seven offers round-the-clock sweetness, optimism and cheek-pinchingly wholesome pop beats. If the songs all blend into a sugary, candy-colored soup, well, you won't mind much when it sounds like the unflappable youthfulness of "Get Up."