Crazy (4Minute EP)

Crazy is the sixth extended play (EP) by South Korean girl group 4Minute. It was released on February 9, 2015, by Cube Entertainment and distributed by Universal Music Group. It was the group's first offering in 11 months since the release of 4Minute World (2014). The EP marked a shift towards a bolder concept and fresh direction for the group and contains six songs. Musically, the album is characterized by the group's signature hip hop sound, while also encompassing several other genres including, trap, dance, Europop, funk, disco and rock.

Upon release, Crazy received generally favourable reviews from music critics, who praised its production, musical direction and the group's vocal performance. Commercially, the album debuted and peaked at number two on South Korea's Gaon Album Chart, and became the fourth best-selling album of February 2015 in the country. It also peaked at number one on the Billboard World Albums chart. The album spawned two lead singles: "Cold Rain" and "Crazy". The former was the first time the group used a ballad as its lead single since their debut; it was released on January 26, 2015, for digital purchase. The title track was released in conjunction with the release of the album, and was subjected to major attention from Western media, with many critics regarding it as one of the best K-pop releases of 2015. It was commercially successful in South Korea and peaked at number three on the Gaon Digital Chart. The song also appeared at number two on the US World Digital Songs chart.

Two music videos were released to accompany to the release of the singles. To promote the album, 4Minutes appeared and performed on several South Korean music programs, including Music Bank, Show! Music Core, and Inkigayo. The group won a total of seven first-place music show awards. The group also held a solo concert in Myanmar, where they performed material from the album.