Sostenes Alfonsos, born in 1984, currently living in Yogyakarta since 1999. Active DJing since 2007 in back2back format called Mystical Soundsystem & Involve in many DIY and DIW party movement around Jakarta – Jogja – Bali. He in one of member ENERGYROOM one of underground party crew movement in Yogyakata since 2004. He also close with the youth culture movement and art colective around Yogyakarta. Joining the Kingdom Of Rebel (KOR) crew by House Of Natural Fiber since 2013 for Manila and Tokyo tour. Sostenes Alfonsos also one of the founder Happy Swinging, and outdoor party gather in Yogyakarta. Until nowadays Sostenes Alfonsos DJing in wide range musical selection around Indonesia with his alter ego called Casual Dance and still pushing underground party in Yogyakarta.