 Another type of silent party, known as mobile clubbing, involves the gathering of a group of people in an unconventional location to dance to music which they provide themselves via a portable music device, such as an MP3 player, listened to on headphones.These flash mob gatherings may involve hundreds of people, transforming public spaces into temporary clubbing areas, in which dancers listen to their personal playlists.To an observer it would appear that the participants are dancing for no apparent reason.