SELECT name FROM track EXCEPT SELECT T2.name FROM race AS T1 JOIN track AS T2 ON T1.track_id  =  T2.track_id WHERE T1.class  =  'GT'
Give the names of tracks that do not have a race in the class 'GT'.
[Schema (values) (types)]: | race_track |  race : race_id (text) , name (number) , class (text) , date (text) , track_id (text) | track : track_id (text) , name (number) , location (text) , seating (text) , year_opened (text);