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The Music For Young Players pieces were intended to be a performance repertoire. Elis Pehkonen (composer of My Cats) had a percussion ensemble at Cirencester school (he succeeded Peter Maxwell Davies) that toured extensively in the UK, Europe and Australia and even appeared on Blue Peter

Brian Dennis Aquarelle:

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You can hear an excerpt here: [[{"fid":"10308","view_mode":"default","type":"media","field_deltas":{"1":{}},"link_text":null,"fields":{},"attributes":{"height":220,"width":220,"class":"media-element file-default","data-delta":"1"}}]]

Many of the pieces have special notations for extended effects. This is from the instruction page for EM by Vic Hoyland.

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You can hear part of EM here: [[{"fid":"10311","view_mode":"default","type":"media","field_deltas":{"1":{}},"link_text":null,"fields":{},"attributes":{"height":220,"width":220,"class":"media-element file-default","data-delta":"1"}}]]

You can find the full exhibiton on the Google Cultural Institute here: http://bit.ly/2oPmzJ4