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Bit of a shock that poor violists have to buy LOTS of different books for exam pieces
I know exactly what you mean! I've just paid out £30 for exam music for my son's grade 3 trumpet - add that to the exam fee and I'm looking at £70 - and he isn't even that bothered about exams!
As for the grade 1 viola, I don't have huge experience, but I do have the 'Time Pieces for Viola book 1', which is quite good value as it has more than one piece for grades 1, 2 and 3 all in the same book.
Having said that, I'm not over keen on the grade one pieces - from list A the Bach isn't bad, and the Purcell I found straightforward but a bit boring. From list 2 I found the Dvorak boring - it's rather repetative(sp?). From list 2 I quite like 'Viola Joke' (well, it's grown on me) but I do think it's a bit tricky.
I also have 'First Repetoire for Viola book 1' From that I liked the Morley from list A, from list B I really enjoyed the Bruckner, and the list C 'March' is nice to play too. The 3 pieces make a nice contrast.
Apart from those I've only looked at the 'Joggers' and 'Runners' stuff which you have looked at already.
If I was taking the exam I would do the three from ' First Repetoire', which only requires one book, Please bear in mind that I say all this from the lofty heights of just starting to look at Grade 2 stuff!
Hope that helps a bit - and I also hope others can help you out with the other pieces on the list.