Madison Square Garden often called "MSG" or simply "The Garden" is the world's most famous arena hosting pro sport, concerts, and other big events. It was home to the first indoor ice rinks in the US. It is the oldest arena in the National Hockey League and the second-oldest arena in the National Basketball Association. The first professional game by Michael Jordan was played on MSG. The ceiling of the MSG is concave rather than convex which gives sound absorptive acoustic insulation, allowing for the sound quality that makes it a concert mecca. MSG is the fourth-busiest music arena in the world in terms of ticket sales.