This one's a banger for the car." The undisclosed rapper was later revealed to be Bun B, once one half of the southern hip hop duo UGK. The song, produced by 2 Much, was released on B.o.B's eighth mixtape, "E.P.I.C (Every Play Is Crucial)". Mack of Sound-Savvy called "Arenas" featuring T.I. "a real stadium sounding record, inspired by his live performances and his penchant for interacting with his fans in concert." B.o.B said he wanted to make "something for the fans to sing along to at the shows" and Mack agreed saying: "Sure enough, towards the end of the song, one glance around the room told me that his plan had worked: a large part of the audience was mouthing the hook. Catchy and not too complicated." A song titled "So Hard to Breathe" was played at the listening session, where B.o.B called it a "sibling or sequel to ‘Don't Let Me Fall’". B.o.B produced this one, and wrote the hook along with Sean Garrett. Mack of Sound-Savvy stated "it opened with a solemn acoustic guitar intro and progresses into a soaring electric guitar backing. Lyrically, it has a tone that's both introspective and retrospective of his career thus far and his life before stardom. He informed us that this song is a favorite of both he and his team. I can definitely hear why." In an interview with PopCrush B.o.B claimed his favorite track on the album to be "So Hard to Breathe": "My favorite track on the album is … it's called ‘Hard to Breathe.’ It may have a different name. I’m not sure what I want to call it yet. But now I guess it's [going to be called] ‘Hard to Breathe.’ I could call it ‘Asphyxiation,’ but then it wouldn’t be [something] very good." He went on to say: "It would kind of be the answer to ‘Don’t Let Me Fall’". "So Hard to Breathe" was released as the second promotional single on April 17, 2012. Before playing "MJ", his collab with St. Louis native Nelly, B.o.B reminded the audience that he's "always been the type of artist to say how I feel" and that the album "really shows all sides of me."