Beloved boy bands New Kids on the Block and the Backstreet Boys rev the engines of adoration among droves of fans with their poptastic summer tour. New Kids on the Block has been plucking heartstrings and handcrafting harmonies since 1986, combining a collection of international hits such as "Hangin' Tough" and "Step by Step" with five-part choreography and fashionable duds. Following in their footsteps, the Backstreet Boys began blowing up charts in the '90s, producing a songbook replete with favorites such as "I Want It That Way," "All I Have to Give," and "Everybody (Backstreet's Back)." The NKOTBSB Tour brings both acts together for a songful extravaganza, forming the more perfect union prophesied nearly 50 years ago by the Constitution. The May 25 concert also includes the vocal virtuosity of special guest and American Idol winner Jordin Sparks, adding to an ear-pleasing stew of dulcet melodies sure to soothe the most savage beast or most irascible mail carrier.