From small clubs and hotels in London with little room for Jagger to move around to selling out stadiums worldwide, Rolling Stones tours have changed significantly over the decades. The Stones' early setups were simple compared to what they became later in the band's career when elaborate stage designs, pyrotechnics and giant screens were used. By the time the Stones toured America in 1969, they began to fill large halls and arenas, such as The Forum in Inglewood, California. They were also using more equipment, including lighting rigs and better sound equipment than they had used in clubs. The 1969 tour is considered a "great watershed tour" by Mick Jagger because they "started hanging the sound and therefore hanging the lights". Attributing the birth of arena rock to the Stones 1969 US tour, "The Guardian" ranked it 19 on their list of the 50 key events in rock music history. Before this tour the loudest sound at large-capacity shows was often the crowd, so the Stones used lighting and sound systems that ensured they could be seen and heard in the biggest arenas. "The Guardian" commented that their "combination of front-of-house excellence and behind the scenes savvy took the business of touring to an entirely new level." During the 1972 tour, the Stones developed a complex light show which included giant mirrors that bounced the light off them.