select t2.concert_name ,  t2.theme ,  count(*) from singer_in_concert as t1 join concert as t2 on t1.concert_id  =  t2.concert_id group by t2.concert_id
What are the names , themes , and number of singers for every concert ?
select t2.concert_name , t2.theme , count ( * ) from singer_in_concert as t1 join concert as t2 on t1.concert_id = t2.concert_id group by t2.concert_id
select t2 . concert_name , t2 . theme , count ( * ) from singer_in_concert as t1 join concert as t2 on t1 . concert_id = t2 . concert_id group by t2 . concert_id
What are the names , themes , and number of singers for every concert ?