AdyS (also known as TheIndisputed21) is a western Vocaloid producer, born in 1992, who makes songs using English Vocaloids and FL Studio. Most of his original music is trance and rock, and he uses OLIVER, Avanna, GUMI English, Sonika (whose Vocaloid 2 vocal he imports into the Vocaloid 3 software), and CYBER DIVA.
AdyS mostly makes original music, but does not always use Vocaloid in his works. His videos often contain commentary and/or annotations containing notes on the songs. AdyS is also the creator of the Bridges to Cross and Witches to Burn series of songs.