The recommended Approach Rate for a Catch the Beat specific difficulty of “normal” difficulty (in accordance with Taiko, this is more to the “insane”-ish level of play rather than an actual “normal”) is AR8. AR9 can be used for faster pace songs as determined by the mapper, but AR10 should never be used for a below-superinsane level of play.It's totally outdated. The most popular AR is around 9, and with the introduction of the difficulty spread having easier difficulties, this guideline is totally useless.