Square dance square dance, very rarely are two modern Western dances ever alike. Like traditional square dancing, recovering from occasional mistakes is often part of the fun. Dancers are encouraged to dance only those programs at which they are reasonably proficient, the default level of achievement being the Mainstream program. All programs are set by Callerlab, the callers' international association, which also governs the training of callers. Irish and Scottish dances are normally done to traditional tunes. English dances may be done to traditional tunes, though, especially at ceilidhs, there is experimentation with many different musical styles. The two types of American
Four square squares are out of bounds. The ball may not touch any portion of an inside line or the player who hit the ball is in error. The lines marking the outermost edges of the court are typically considered in-bounds. These boundary rules are often described as "inside out, outside in." In recreational play, and even with a judge in tournament play, it is often difficult to determine if the ball hits the line. Four square is played with a rubber playground ball, typically 8.5" diameter, and inflated to 2 psi (lb/sq in). However, other sizes and types of balls can