Before performing at the Cartoon Network’s Adult Swim upfront presentation Wednesday, Kanye West requested a bizarre preview of his upcoming album while shopping at Atrium in Soho. West brought the album to the store and asked for it to be played while he browsed. “He sang along to some songs for a few shoppers,” said our spy. Atrium reps tweeted, “Mr. West gave . . . a little taste of his new album at the store this morning. Nice way to start the day.”) Later at Roseland, West gave another eccentric show after his onstage “screeching” rattled fashionistas at the Met Ball. “I ain’t no muthaf – – king celebrity!” he yelled. “I’m the worst kind of celebrity. All I do is make real music . . . real s–t.” The baby daddy of Kim Kardashian (arguably a muthaf- – king celebrity) then performed “a medley of his crowd favorites and new songs” for guests including Aziz Ansari, Questlove, Seth Green and Rob Corddry.