mysql - Select most popular tags from database? -

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I have a link to two tables at once through the third table 

  Sources: ID, name tag: id, name thread_tag_map: threads_id, tag_ id

Many of its many relationships. I want to select 30 tags which are most popular, which are going to be the first 30 tags with tags_id , which is the highest in thread_tag_map . 

  select t. Tag Jen from tags * thread_tag_map ttm ON t.id = ttm.tags_id Group TID TDID) DESC limit 30

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