Hip-hop recording artist Mos Def, along with his “human beatbox” entertain media and others at Def Poetry sound check What's The 411 attended a media event for Russell Simmons Presents Def Poetry, better known as Def Poetry Jam, and captured Mos Def doing a sound check. Def Poetry Jam, a spoken word poetry television series which is hosted by Mos Def, features many established and up-and-coming poets and spoken word artists. Just prior to the sound check, What’s The 411 producer Ruth J. Morrison, got an interview with Russell Simmons, who spoke about the value of poetry and spoken word. Additionally, Uncle Rush was on hand earlier for a photo opp with Alicia Keys and John Legend. Def Poetry Jam aired on HBO from 2002 through 2007.