This website shows both names: http://www.jvcmusic.co.jp/seatbelts/. For those of us who have an easy time working around tons of Chinese and Japanese characters, シートベルツ is fine, but when they use SEATBELTS, there is no real problem. The only real sticking point is that there are two sites on Last.fm, which could easily be remedied. How about people just enjoy the awesome music? ^^
right official tag is: [artist]シートベルツ[/artist] . it doesn't matter if you are western or not, you need to respect original artist name ! also like you respect western artists, respect asian also. please redirect tag to right one.