-- Database schema
| stadium : Stadium_ID [ INT ] primary_key , Location [ TEXT ] , Name [ TEXT ] , Capacity [ INT ] , Highest [ INT ] , Lowest [ INT ] , Average [ INT ] | singer : Singer_ID [ INT ] primary_key , Name [ TEXT ] , Country [ TEXT ] , Song_Name [ TEXT ] , Song_release_year [ TEXT ] , Age [ INT ] , Is_male [ bool ] | concert : concert_ID [ INT ] primary_key , concert_Name [ TEXT ] , Theme [ TEXT ] , Stadium_ID [ TEXT ] concert.Stadium_ID = stadium.Stadium_ID , Year [ TEXT ] | singer_in_concert : concert_ID [ INT ] primary_key singer_in_concert.concert_ID = concert.concert_ID , Singer_ID [ TEXT ] singer_in_concert.Singer_ID = singer.Singer_ID |
-- -- What are the names of the singers who performed in a concert in 2014?

SELECT T2.name FROM singer_in_concert AS T1 JOIN singer AS T2 ON T1.singer_id  =  T2.singer_id JOIN concert AS T3 ON T1.concert_id  =  T3.concert_id WHERE T3.year  =  2014;