It would
be capitalized if I could make a backwards 'B'. Realistically, the
capitalized name is the band's (corporate) logo and the reversed letter
emphasizes the palindrome that the name's derived from.
If I
can't recreate it properly on the page, it's best to do what (almost)
every other site does and just use the lower case letters. Also, even if
it could be done, it's a registered logo, so I'd likely have to add an
"®" to the end which might look a bit odd on the page.
The wiki link I added does
capitalize the name, but without the ability to reverse the 'B', I
always think, "Get it right or don't bother." It's a judgment call, and I
always lean toward the "get it right" side of things.