All in One Revision Booklet Grade 2 Music Theory. This revision booklet accompanies All in One to Grade 5 and provides practice for topics covered in the Associated Board and Trinity Guildhall Grade 2 music theory exams.Many questions test a pupil's comprehension of more than one topic at once and wording, wherever possible, is the same as that used by the relevant exam board so that students will feel well prepared and confident in the final stages before an exam.