Question: What occupation is shared by Luca Prodan and Glenn Gregory?
Related documents: [0]  [DOC] Glenn Peter Gregory (born 16 May 1958) is an English singer, songwriter, and multi-instrumentalist whose music career spans more than 30 years. He came to prominence in the early 1980s as co-founder and lead singer of the new wave and synthpop band Heaven 17, which released six singles that entered the Top 40 charts in the United Kingdom during the 1980s, and 1990s, including "Temptation", "Come Live with Me", "Crushed by the Wheels of Industry", "Sunset Now", "This Is Mine", and "(We Don't Need This) Fascist Groove Thang" . [END] 
[1]  [DOC] Luca Prodan (17 May 1953 – 22 December 1987) was an Italian–Scotish musician and singer. He was the leader and singer of Sumo, one of the most influential rock bands of Argentina, and is widely considered as one of the most important artists of the last quarter of the twentieth century in his country. [END] 
Answer: 
singer
singer