BTS return after nearly four years with 'ARIRANG', a 14-track fifth studio album that mixes trap/hip-hop roots, pop experiments and traditional Korean elements. Opener 'Body to Body' uses a melody from the folk song 'Arirang'; the interlude 'No. 29' features the Divine Bell of King Seongdeok. Big-name producers include Mike WiLL Made-It, Kevin Parker, Diplo and Ryan Tedder. RM is credited on every non-interlude track; members contributed across the album. Standouts: 'FYA' and 'Merry Go Round'. Overall: ambitious, stadium-sized and rated 4/5.