The Beatles' success established the popularity of British musical acts for the first time in the US. By mid 1964, several more UK acts came to the US, including the Dave Clark Five, the Rolling Stones, Billy J. Kramer, and Gerry & the Pacemakers. Completing what commentators termed the British Invasion of the US pop market, one-third of all top ten hits there in 1964 were performed by British acts. The Beatles' chart domination was repeated in countries around the world during 1964, as were the familiar displays of mania wherever the band played. Fans besieged their hotels, where sheets and pillowcases were stolen for souvenirs. As the phenomenon escalated over 1964–65, travelling to concert venues involved a journey via helicopter and armoured car. These arrangements came to resemble military operations, with decoy vehicles and a level of security normally afforded a head of state. Contrary to the presentable image the Beatles maintained for reporters covering the tours, their evening parties often descended into orgies with female admirers, which Lennon later likened to the scenes of Roman decadence in Frederico Fellini's film "Satyricon".