SELECT T2.lastname FROM Performance AS T1 JOIN Band AS T2 ON T1.bandmate  =  T2.id JOIN Songs AS T3 ON T3.SongId  =  T1.SongId GROUP BY lastname ORDER BY count(*) DESC LIMIT 1
What is the last name of the musician that have produced the most number of songs?
SELECT T2.lastname FROM Performance AS T1 JOIN Band AS T2 ON T1.bandmate = T2.id JOIN Songs AS T3 ON T3.SongId = T1.SongId GROUP BY lastname ORDER BY count ( * ) DESC LIMIT 1
select t2 . lastname from performance as t1 join band as t2 on t1 . bandmate = t2 . id join songs as t3 on t3 . songid = t1 . songid group by lastname order by count ( * ) desc limit value
What is the last name of the musician that have produced the most number of songs ?