[1][2] In December 2010, Big Boi, one half of famed hip hop duo Outkast, accidentally discovered Phantogram, an electronic rock duo consisting of Josh Carter and Sarah Barthel, when hearing their single "Mouthful of Diamonds" in a pop-up ad.

[5] David Jeffries of AllMusic said, "The MC's copious sex talk makes Phantogram seem like Catherine Deneuve and Bowie in The Hunger, a stoic and sexy duo who let others to do the "dirty work," and just like those vampires, this EP dazzles and then disappears before the sun comes up, leaving listeners with the exhilarating feeling of "wow," and the less-pleasing feeling of "what happened?

"[7] David Turner of Rolling Stone stated, "Even guest turns from Run the Jewels and Skrillex can't add enough energy to make Big Grams feel like anything more than an attempt at landing a better festival slot.

"[11] Sheldon Pearce of HipHopDX said, "There's no creative expansion, just two acts trying to exist in their own worlds simultaneously instead of finding a new and interesting middle ground.

"[9] The album debuted at number 38 on the Billboard 200, selling 9,626 copies in the United States;[13] "Lights On" reached No.