Правильно SQL:
Select Top (10) artist.name, Tracks = Count(*)
From artist
Inner Join album On artist.artist_id = album.artist_id
Inner Join track On album.album_id = track.album_id
Group By artist.Name
Order By Tracks Desc
Или, для доступа, давайте праздновать, как это '89:
Select Top 10 artist.name, Count(track.track_id) As Tracks
From (album Inner Join artist On album.artist_id = artist.artist_id)
Inner Join track On album.album_id = track.album_id
Group By artist.name
Order By 2 desc;