Skull refers to several artists.

1) Skull is one of the recording monikers of English producer and former Output Recordings label boss Trevor Jackson, known more popularly as Playgroup and The Underdog. Skull's music was heavy, plodding instrumental hip-hop with stuttering, syncopated beats and slowed down sounds. Apart from compilation appearances, there is one Skull release, Snapz

2) Skull is also a japanese visual kei Band formed in 2003 with SIN on vocals, Dai (ダイ) on guitar, Sakura (さくら) on bass and Tetsuya (てつや) on drums.

3) Skull is also the name of a defunct Swedish thrash metal band, formed in 1990, who released one private demo during the same year. In addition to the demo, they also appeared with the track "On a mission in blood" in the CBR compilation "Projections of a Stained Mind" from year 1991. The band members went on to form Teddybears STHLM now simply called TeddyBears

4) There is another artist named Skull who is a Korean reggae solo artist in U.S. and also part of the Korean duo, "Stony Skunk."
Skull's Myspace: click

5) it's also the first Thiaz Itch project from 1999 to 2000: hardcore / breakcore / speedcore music
for more info goto thiazsch.free.fr/archives.htm