CREATE TABLE table_27455867_1 (audition_city VARCHAR, audition_venue VARCHAR)

In how many different audition cities were the Bridgestone arena auditions held?
SELECT COUNT(audition_city) FROM table_27455867_1 WHERE audition_venue = "Bridgestone Arena"
SELECT COUNT("audition_city") FROM "table_27455867_1" WHERE "Bridgestone Arena" = "audition_venue"