"I Say Yeah!" is a single released by all 5 of NeOSITE DISCS' signed artists to celebrate their 10th anniversary. The single received minor popularity, debuting at #8, dropping to #20 in its second week and stayed on the charts for a total of 7 weeks. The A-side was also the opening theme for NTV's "MUSIC FIGHTER" in the month of October. A live concert was held at SHIBUYA-AX on October 27, 2006 to celebrate the 10th anniversary, with all of the participating artists performing the A-side from the single as well as a number of their own tracks.