ㄷㅇㄷ긔딛ᆞㄷThe Sentimental Chord is the fourth Korean studio album by SG Wannabe. Again, they amazed the audience with their new title song "Arirang" ("아리랑"), which had the classic instruments of Korea playing as the background music. With the release of their 4th album and their title song, they went as the #1 in the Bugs Chart as well as the Korea monthly chart. The album was also number one on the "Top 20 Album Sales (May 2007)" with 44,618 copies sold in May and 125,450 sold altogether.