For many years, Italian was a second language to Wagner's operas, as scores of Italian singers performed the composer's music in their native tongue. Based on his Italian performances, tenor Giuseppe Borgatti became the first Italian heldentenor to be invited to perform at Bayreuth. Although, after the war, most Italian opera houses presented Wagner in German, great post-war artists such as Mario Del Monaco, Renata Tebaldi, and Maria Callas became the last generation to sing Wagner's music in Italian.