 Complete the following phrase:  After beginning recording sessions for a planned new album, the group returned to the United States for a 30-day tour in June and July to support Tommy. In the year since the release of Tommy, the group had become rock superstars and now commanded considerably larger venues than on previous stints in the country, when they played mostly in theatres and colleges. The tour began with the bands final opera house date, as they performed two shows at New York Citys Metropolitan Opera House. Following the American tour, the band was one of the headlining acts at the 