What are the party emails associated with parties that used the party form that is the most common?
SELECT t1.party_email FROM parties AS t1 JOIN party_forms AS t2 ON t1.party_id  =  t2.party_id WHERE t2.form_id  =  (SELECT form_id FROM party_forms GROUP BY form_id ORDER BY count(*) DESC LIMIT 1)
SELECT t1.party_email FROM parties AS t1 JOIN party_forms AS t2 ON t1.party_id  =  t2.party_id WHERE t2.form_id  =  (SELECT form_id FROM party_forms GROUP BY form_id ORDER BY count(*) DESC LIMIT 1)
[{'party_email': 'alanna.boehm@example.net'}, {'party_email': 'lucinda83@example.org'}, {'party_email': 'erick.mills@example.com'}]