(64 downbeats). In a few tunes the A and B parts are half the normal length; in others, particularly those derived from marches or rags, one or more parts are twice the normal length. Practice varies among fiddlers as to whether to repeat the parts of such non-standard tunes. In some areas, notably Quebec and parts of the southern and southwestern United States, there is a strong tradition of playing "crooked" tunes — tunes in which at least one part has more or fewer beats than the norm. Because callers in those areas do not synchronize their calls with the phrases of the music, crooked tunes do not bother them. In regions where the callers and dancers are used to staying "on phrase" (as in a contra dance), crooked tunes are not used for square dancing. In the northeastern United States, traditional square dances are frequently done to popular songs in addition to, or instead of, jigs and reels. Where this is done, the caller typically sings the calls, substituting dance directions for some of the words of the song but reverting to the original lyrics for the last few measures of each chorus, often encouraging the dancers to sing along. Singing callers normally choose songs that are similar in structure to fiddle tunes—the same number of measures, played at a similar tempo. There are exceptions, however: a waltz such as "Take Me Out to the Ball Game" may be sped up from its original time to a fast time. Organization and social customs "Survival" dances are typically either run by a band or caller as a profit-making enterprise, or sponsored by a non-dance organization (such as a church, a Grange, or a fire department) as a social service and/or a fundraiser for its other activities. The dance may be advertised as open to the public, but the vast majority of those attending are likely to be local people who know one another. Almost everyone present is likely to know the dances: often there will be little or no teaching or walkthrough, and in some communities the same few dances are done at every meeting, without a caller. The dancers may dress up a bit—though not necessarily in square-dance-specific costumes—and they may attend and dance exclusively with a spouse or other regular partner. "Revival" dances are usually run by a nonprofit organization set up specifically to sponsor dance events, though