D.E.F是由Tigh-Z、Iroha和Limit组成的DEF MUSIC全明星梦幻组合。团名取自Drama、Extreme、Future，同时“DEF”也意味着最佳，象征迈向如戏剧般极致而激进的未来。Tigh-Z在代表作《Osaka LOVER》发行后，于Zepp Namba和Zepp Nagoya成功举办个人演出；出道曲《THRILL》被选为朝日电视台《Yasutomo Itteite serious》片尾曲，人气飙升；Iroha是曾获选为朝日电视台《GAKUON!》主打嘉宾的女子舞蹈演唱团体。由TAKAMICHI与Melo联手孕育的这一组合，YouTube播放量突破2000万次，并曾打入Oricon榜单前十名。在2021年5月7日大阪城Hall个人演唱会之前，他们发行了首张EP《D.E.F principle》，全部歌曲由Melo制作。该EP被选为朝日放送电视台《Night in Night Ima-chan's"actually..."》8月片尾曲，备受瞩目。[D.E.F] D.E.F.Proud to play YouTube 20 million times and once entered the top 10 Oricon chartsBIRTH to TAKAMICHI, Melo.Tigh-Z became the center of attention after a successful solo performance at Zepp Namaba and Zepp Nagoya after the release of the masterpiece"Osaka LOVER".From the debut song, THRILL, whose popularity has skyrocketed due to being selected as the ending theme on the Asahi broadcast"Yasutomo Itteite serious".This is a girl dance vocal group Iroha who has been selected as a headliner on Asahi's"GAKUON!"And DEF MUSIC all-star dream group"D.E.F" which consists of Limit that producer TAKAMICHI called himself a talent and scouted himself.Origin is Drama, Extreme, Future.To a radical future like a drama.And"DEF" means the best.Finally, the solo performance at Osaka Castle Hall will be decided at 2021.05.07.Prior to that, he released his 1st EP"D.E.F principle". All tracks are produced by Melo.D.E.F principle has been attracting attention as early as the Asahi Broadcasting TV Night in Night Ima-chan's"actually..." was selected as the ending theme in August.