LET THE MUSIC PLAY: In most respects, the musical accompaniment to President Obama's second inauguration is what you'd expect--the Brooklyn Tabernacle Choir's inspiring "Battle Hymn of the Republic," a spare "America the Beautiful" from troubadour James Taylor; Kelly Clarkson warbling "My Country 'Tis of Thee" with military-orchestra accompaniment and Beyoncé crooning our national anthem. But at least one music event surrounding this national ritual didn't go quite as planned. Performing at last night’s StartUp RockOn event last night, rapper Lupe Fiasco performed a 30-minute version of his anti-war, anti-Obama song, “Words I Never Said” (“Obama didn’t say shit/That’s why I ain’t vote for him next time either”) before getting escorted off-stage by security personnel. Meanwhile, Russell Simmons threw his Hip-Hop Inaugural Ball II at the Harmen Center in the Chinatown section of the capitol last night, with such old-school hip-hop artists as Doug E. Fresh, Swizz Beatz, MC Lyte, Fab Five Freddy and Yo-Yo. The event was hosted by Carmelo Anthony’s wife La La and Terrence J. Even 2 Chainz dressed for the occasion, dropping his necklaces for a sleek Versace suit. Others slated to perform at official events over the weekend included Alicia Keys, Brad Paisley, Usher, Katy Perry, Mana, Smokey Robinson, Stevie Wonder, Marc Anthony, John Legend, Far East Movement, fun. and Mindless Behavior. (1/21p)