Show me the tracks that are in AAC audio file media type
select * from mediatype as t1 join track as t2 on t1.mediatypeid = t2.mediatypeid where t1.name = "AAC audio file"
How many are there?
select count(*) from mediatype as t1 join track as t2 on t1.mediatypeid = t2.mediatypeid where t1.name = "AAC audio file"