Question: Are Gaz Coombes and Petri Lindroos both vocalists?
Related documents: [0]  [DOC] Gareth "Gaz" Michael Coombes (born 8 March 1976 in Oxford) is an English musician and singer-songwriter, best known as the lead vocalist and guitarist of the English alternative rock band Supergrass. He first entered the music scene aged sixteen as the lead singer of the band The Jennifers which featured Supergrass bandmate Danny Goffey. Coombes was noticeable for his large sideburns during the 1990s. [END] 
[1]  [DOC] Petri Lindroos (born 10 January 1980 in Espoo, Finland) is a melodic death/folk metal guitarist and vocalist. He is currently the lead vocalist in Ensiferum and, prior to this, was a founder and lead vocalist for Norther. [END] 
Answer: 
yes
yes