How come some WWE wrestlers keep the same music for many years but other wrestlers don't ?

Currently the old guys Brock Lesnar, John Cena, Randy Orton, Shane McMahon, Kurt Angle, Mickie James, The Miz, Vince McMahon, Triple H and Chris Jericho or the guys who don't wrestle anynore but still show up in cameos like Stone Cold, Mick Foley and Shawn Michaels still have their theme songs from the past... show more Currently the old guys Brock Lesnar, John Cena, Randy Orton, Shane McMahon, Kurt Angle, Mickie James, The Miz, Vince McMahon, Triple H and Chris Jericho or the guys who don't wrestle anynore but still show up in cameos like Stone Cold, Mick Foley and Shawn Michaels still have their theme songs from the past until now. Although they had different themes when they were wrestling full time, they always have that one song that they keep for the rest of their careers even years after said wrestler retires (like I said already). But the other returning wrestlers have their music completely changed every time they come back or if he came from WCW or TNA like Kane, The Rock, Bret Hart, The Undertaker, Goldberg, Sting and even DDP. Why is that ?
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