Find the first name of the band mate that has performed in most songs.
create table songs (songid varchar, PRIMARY KEY (songid)); create table band (firstname varchar, id varchar, PRIMARY KEY (firstname)); create table performance (bandmate varchar, PRIMARY KEY (bandmate))
select t2.firstname from performance as t1 join band as t2 on t1.bandmate = t2.id join songs as t3 on t3.songid = t1.songid group by firstname order by count(*) desc limit 1