Nostalgia, Ultra (stylized as nostalgia,ULTRA.) is the debut mixtape by American recording artist Frank Ocean. It was released on February 16, 2011. Ocean was inspired to make the mixtape, after Hurricane Katrina in his native New Orleans and his subsequent relocation to Los Angeles. After joining alternative hip hop group Odd Future in 2010, he self-released the mixtape, without initial promotion. Nostalgia, Ultra has a unique R&B aesthetic and features surreal themes and nostalgic lyrics. The songs mostly focus on interpersonal relationships, personal reflection, and social commentary. Following its release, the mixtape received rave reviews from music critics. The cover features a picture of a bright orange 1980s BMW E30 M3, Ocean's "dream car", in plain sight amidst lush greenery.