But the spirituality coursing through 30 years of U2's music has never earned U2, who play Reliant Stadium on Wednesday, the tag of Christian rock band, a stigma of sorts in mainstream music.

Do your vintage rock band T-shirts have financial value? If you’ve held on to some of your classic concert rock T-shirts, you could actually have an investment on your hands as a new study shows ...

The band's "Panther" T-shirt sits atop the list as the shirt with the most resale value, with the study noting that purchasing an original version of the shirt can set you back up to $2,750.00.