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 Thomas Wilson: String Quartet No 4 [download] £17.00 McEwen: String Quartet no. 17 in C# minor 'Fantasia' (1947) £18.00 Derek Ball: For Charlie [download] £3.25 McEwen: String Quartet no. 14 in D minor (1936) £29.00 Gemma McGregor: The Silent Chapel [download] £10.50