Akon is still learning the words to his upcoming mix tape “Konkrete Jungle.” At Nima Yamini’s weekly Avenue A Soundcheck party at Double Seven, the rapper debuted several new tracks. But during the second verse of his remix of Gotye’s hit “Somebody That I Used To Know,” Akon stopped the music. “Excuse me, I just made this song, like, last week, so I’m still learning the lyrics, OK?” he apologized before restarting. “Jungle,” out next month, features DJ Whoo Kid & Evil Empire.