IN THE MAJORITY OF CASES PHOTOCOPYING MUSIC IS ILLEGAL: DO NOT DO IT!
The Music Publisher's Code of Fair Practice (http://www.mpaonline.org.uk/content/code-fair-practice)
only applies to UK publications where the copyright owner is listed as a signatory of the code.
You are NOT allowed to copy whole works, movements or songs
You are NOT allowed to copy from a number of publications to compile an anthology.
You are only allowed to make a copy of an extract
in an emergency (e.g. when there is no time to replace a damaged copy),
to aid personal performance (e.g. for page turning)
or for private study and research.
Under no circumstances does the code allow for the copying of whole works, movements or songs.