Buy music › Derek Ball: Mary's Piece [download] Image 1 of 1 Derek Ball: Mary's Piece [download] £5.75 Computer typeset score (10pp) saved to PDF for immediate download. Add To Cart Added! Computer typeset score (10pp) saved to PDF for immediate download. Version for String Quartet, 1999. You might also like Diana Hamilton: String Quartet No.1 [download] £19.50 McEwen: String Quartet No 9 in B Minor (1920) £26.00 McEwen: String Quartet No 13 in C Minor (1928) £25.00 Claire McCue: Beauty and the Beastie [download] £22.00 McEwen: String Quartet No 15 : A Little Quartet 'In modo scotico' (1936) £24.00