There are 2 artists called Lucas Silveira

1) The singer/guitarrist of Canadian rock band The Cliks
2) A Brazilian singer
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1) Lucas Silveira (born Lilla Silveira) is the Canadian singer/guitarist of the rock band The Cliks.
Born in Canada to a Portuguese-Canadian family, he lived from the age of four to the age of ten on Pico Island, part of the Azorean archipelago (an autonomous region of Portugal).
Silviera is a transgender man. He was recently interviewed by the Associated Press, the resulting article has appeared on the MSNBC website and elsewhere. Silveira has also been interviewed by the Boston Globe, as well as many radio stations, quickly becoming one of the most visible transgender people in the music industry.

2) Lucas Silveira is the leader of Brazilian band Fresno. He also has a solo project called Beeshop