UFC: Impostor chose Rory MacDonald's walkout music for years
Walkout music isn't huge business in MMA, but it is an associative identifier to certain fighters, lending it some level of importance. When I hear "Sandstorm", I think of Wanderlei Silva. When I hear "Bad reputation", I think of Ronda Rousey. A fighter's music serves another purpose in that it helps put them in the zone or amps them up for the impending violence they are about to engage in.