They could also do lots of other stuff too, like have an ad based on their album Hell Awaits, and say (while the song "Hell Awaits" plays in the background): "If hell awaits you this tax season, call Tax Slayer: We'll slay your tax problems!" Or they could use their album Seasons in the Abyss, and say (while the song "Seasons in the Abyss" plays in the background): "This tax season doesn't have to feel like a season in the abyss! Call the tax professionals at Tax Slayer, and we'll slay the IRS beast for you!" (Can you tell I'm a big Slayer fan?)
Or is it possible this tax service is unaffiliated with the band Slayer? And if that's the case, then would it be legal for me to set up a business called "Tax Metallica" or "Tax Megadeth"? (Tax Metallica could have an ad that says: "Don't let the 'creeping death' of your tax problems make your hope 'fade to black'! Call the tax professionals at Tax Metallica! We'll take your tax problems and 'kill 'em all'!")