403 403 Forbiddena is a J-Rock band that sings completely in English and appear to be heavily influenced by the power metal genre. The "403" part of their name refers to the radio station their music is regularly played on, while Forbiddena is the name of the group. It's also a play off the common "403 Forbidden" message displayed in internet browsers. Originally a small-time band composed of university students, they became quite popular as a local indie band.