Collaboration: Halcali 2w205h

Halcali (a portmanteau of the names Halca (ハルカ) and Yucali ()) is a Japanese Hip-hop duo consisting of Halca (born April 21, 1988) and Yucali (born July 18, 1987) from Meguro, Tokyo. They were signed to Oshare Track Factory on July 26, 2002 when lead singers Halca and Yucali, now both graduates from Meguro, attended an audition for "female rappers" held by the group Rip Slyme, and were chosen out of several applicants as the singers for the band. Their first single, "Tandem" which was released on January 8, 2003 was marketed on several Japanese television networks and MTV at the time of its release and entered into the Oricon Charts at position 19. The following debut album, HALCALI BACON, reached #5 on the Oricon charts, making it the first album by a female hip-hop artist to enter the top ten.

HALCALI made their American debut in May 2008 as the musical guests of honor at the Chicago-area Japanese culture, manga and anime convention Anime Central. They performed again in America at Central Park, New York City on June 1, 2008 as part of a Japan Day Festival as part of the Youkoso Japan tourism campaign.