I'm running an investigation with my students where we're trying to query the Wolfram Knowledgebase to give me a list of data properties associated with a particular (chosen) MusicAct. For example, the number of songs on all of the studio albums produced by "The Offspring". I can get the number of songs for all of the albums, but I am struggling to reduce this to only the studio albums (of "MusicAlbumType" - "MusicAlbum").

The command I have used for retrieving the album song length is below. Any help is much appreciated!

EntityValue[
  EntityValue[Entity["MusicAct", "TheOffspring::7k2n5"], "Albums"], 
  "CanonicalNumberOfSongs"] // EntityList