If you google BRC Area 10, under the competitions tab there is a Dressage to Music Comp.... you can download all the info you need from the link on there (it's a word document)
Walk - free and medium, min 20m each
Trot - 15m circle on each rein, lengthened strides
Canter - 20m circle on each rein
Halt at start and end.
Routine must be between 4min & 4.5 min from move off after first halt to final halt.
You need to be a Music Member of BD to compete in RC competitions which allows RC riders to be covered by BD's agreement with PPL.
Music used must be either all registered with PPL or all not registered. Unfortunately the only way of telling if the record company is registered with PPL is to look on the PPL Repertoire list, which seems to have disappeared from the BD web site. However, BD will send you a copy when you join as a Music member if you ask them to. Almost all the big record labels are PPL registered - it is only the very small ones and foreign labels which may not be. If you take all your music form one CD then there is no problem.
There was an article in Riding Clubs magazine earlier this year which went through the basics, worth looking out a copy of that.
Time is 4 - 5 mins for BD Novice as that is usually in the long arena, but RC Novice - though using identical movements, is always in the 20 x 40 arena and shorter at 4 - 4.5 mins.
Which is why BD Novice is 4 - 5 mins and all others (except GP) are 4.5 - 5 mins. BD adjusted their timing rules so that RC members could use their music in BD Novice competitions.
Thats alarming - I rode at the RC DTM last year I was never informed that the time allowed was shorter. Fortunately I didnt get penalised but my test was certainly over 4.5 mins. Typical RC though.