Kanye West unleashed some unreleased tunes at the Dream Downtown Friday. After hanging at a table with Leonardo DiCaprio, Erin Heatherton and “The Hangover” director Todd Phillips, the rapper pulled out a laptop and headed to the DJ booth at PH-D with DJ Reach to unveil the tunes. “He was dressed in black pants and a leather T-shirt,” said a spy, adding that West “danced and lip-synced” to his songs. “The room looked stunned. People were standing around with jaws literally dropped.”