a2c (横山厚, Yokoyama Atsushi, born on February 11, 1979 in Tochigi, Japan) is a Japanese composer, arranger, musician and lyricist. He's best known for being a member and the co-founder (with setzer) of MintJam, as well as a member of G5 Project. The stage name a2c might be a pun on Yokoyama's first name, as "Atsushi" and "A-Two-C" are almost pronounced the same in spoken Japanese.