#1 to Infinity was a concert residency by American singer-songwriter Mariah Carey at The Colosseum at Caesars Palace in Las Vegas. It began on May 6, 2015, and concluded on July 18, 2017. The show featured all eighteen of Carey’s US number-one singles in chronological order, closing with her then-new single “Infinity.” Several songs were presented in alternate arrangements, including hip-hop remix versions of “Fantasy,” “Honey,” “Heartbreaker,” and “Thank God I Found You,” while “Someday” was performed in a style closer to its MTV Unplugged rendition. Robin Leach of the Las Vegas Sun praised the opening performance, describing Carey as “the highest-pitched contemporary pop singer of the decade.”