According to ESRB, this game contains: Mild Lyrics
Parents don't have anything to fear in Frequency except a difficulty curve that will give your kids emotional trauma. In all seriousness however, there's nothing to fear since all the graphics revolve around colorful shapes, psychedelic patterns and harmless line art. Some of the songs may have an aggressive tone to them along with one or two mildly political rap lyrics, but that's really as far as it goes. Nothing naughty in this one, and no blood or gore whatsoever. It's definitely for the older kids, though.
Gamers in general will find a game that's initially exciting, but they might be quickly turned off by the significant difficulty. There are multiplayer options (up to four with a multitap) and a complex remix mode that lets you tinker around with musical arrangements that add to the play value somewhat. The music is mostly techno with a couple of turntable efforts and a smattering of rock. Songs are provided by twenty-five actual artists including No Doubt, Roni Size, The Jungle Brothers, The Crystal Method, and the Dub Pistols, among others.
Music game fans looking for serious challenge need look no further. While Frequency is one of the better music games on the Easy difficulty, it's marred by some basic design and play choices that keep it out of the top tier. Even still, it's different enough from the crowd to warrant a look. If there's ever a sequel that addresses these issues, it should be a knockout.
I don't think I need to say this, but hearing-impaired gamers shouldn't bother unless they can hear music with or without assistance. With no auditory stimulation in conjunction with gameplay, Frequency will be pretty boring and pointless.