Antwan "Big Boi" Patton is used to being flooded with flamboyance: in his day job as half of Atlantan psych-hop duo OutKast he is the straight-man to the hip-hop Prince that is Andre 3000. Here, Big Boi hits Brixton trailing an entire basketball festival in his wake.Nearby, Windrush Square was overtaken by professional basketballers all afternoon, and his support acts at the Academy include a brass band, pros shooting at an on-stage hoop and a dance-off between two fluffy-costumed mascots. Wherever Big Boi goes, a carnival follows.

With OutKast on indefinite hiatus since their 2006 soundtrack album Idlewild, the sensible solo artist might have used this £5-a-head event to impress the curious and destroy his reputation as rap's Ernie Wise by sticking solely to his acclaimed 2010 solo debut Sir Luscious Left Foot: the Son of Chico Dusty, a record every bit as lustrous, psychedelic and inventive as OutKast's best. But Big Boi, swept up in the festival spirit, discards sense for showmanship and piles into a barrage of OutKast classics at relentless pace. The silken grooves of So Fresh, So Clean and emancipation anthem Rosa Parks give way to a majestic Ms Jackson within the first 10 minutes. By the time Ghettomusick's tech-rap tirade segues into the jungle jubilation of BOB – the Iraq invasion you can dance to – it's clear we're witnessing one of the tightest and mightiest rap shows on the planet. You even begin to wonder if he has the cheek and chutzpah to crack out a chorus of Andre 3000's Hey Ya!

He doesn't, but the fact that newer tracks such as the operatic battle-rap General Patton hold their own against the decade-old chart-topper The Way You Move is testament to Big Boi's ability to carry OutKast's inspirational rap torch. A slam dunk.