David "Space Beaver" Guillas is a Canadian guitarist. Formerly of Giant Sons and Rough Music, he is currently a member of hardcore punk band Propagandhi. Along with his band, he lives a vegan lifestyle and supports animal rights.
In early April 2002, Guillas played guitar for Giant Sons, a roots rock
band in Winnipeg, Manitoba. The band broke up in August 2003, and ex-members of Giant Sons and Standstill formed a new band called Rough Music in February or March of 2004.
In August of 2006 he become an official member of Winnipeg hardcore punk outfit Propagandhi, who are still active on the Winnipeg music scene.
A 15 track Giant Sons album titled Anthology was released on G7 Welcoming Committee Records in 2006, and is still available for download on their website.