Esperansa de totz ferms esperans is a religious alba addressed to the Virgin Mary.
L'autriers, a l'intrada d'abril is a pious pastorela that may allude to Joan Oliva, a Catalan friar who was active post-1270.
His earliest datable work is tenso with God, Seinhos, aujas, c'aves saber e sen, which must have been written sometime between the fall of Caesarea and Arsuf to the Mamluks in 1265 and the Crusade led by James the Conqueror—mentioned in the poem—in 1269.
The chief object of Guilhem's addresses to God was a common one among troubadours of his time: the papal policy of launching Crusades against Christians or heretics in Europe to the detriment of the Crusader States in the Holy Land, and the rise of the Mamluks in Egypt and Syria.
Guilhem's only other datable work is a lengthy planh on the death of Louis IX of France (1270), Fortz tristors es e salvaj'a retraire.