D.A. calls Justin Bieber's surprise MacArthur Park gig a 'testament to ... progress'CultureSep 22 at 8:19 PM – Sep 23 at 9:17 AM3 outletsUnited StatesLos Angeles TimesD.A. calls Justin Bieber's surprise MacArthur Park gig a 'testament to ... progress' Sep 23 at 6:00 AMNew York PostJustin Bieber stuns MacArthur Park onlookers with surprise concert Sep 22 at 8:19 PMBillboardJustin Bieber Pulls Up For Surprise Jam Session in L.A.’s MacArthur Park Sep 23 at 9:17 AM