Sigma 5
Artist with the following albums: "Busca", "Initium"

Sigma 6
Artist with "demo" album

Sigma 7
Artist with the following albums: "Searching 4 Victims", "From 60 to 170 BPM", "The great jump"

Sigma 909
Artist with "Hardcore Terror" album

SIGMA allstars
Artist with the following albums: "Planet Pop", "Somewhere in America"

Sigma Draconis
Artist with the following albums: "De Rervm Natura", "De Rerum Natura", "Vae Victis "It Will End in Blood""

Sigma Tibet
Artist with "Different World" album

SIGMA-allstars
Artist with "Life is so short" album

Sigma音樂
Artist with "至高尊名" album

Sigman Sand
Artist with "Valley" album

Sigmatibet
Artist with the following albums: "Different World", "Chills"

Sigmatropic
Artist with the following albums: "16 Haiku Kai Alles Istories", "Sixteen Haiku & Other Stories Bonus CD", "Sixteen haiku & other stories - Songs based on the poetry of Geo", etc...