what factors go into making certain music good for working to?

I suggest the following

1. fairly upbeat to propel you along and keep you energised

2. something that you know quite well so you don't get caught up listening more intently than you should

3. Nothing too harsh or abrasive, you need to keep focussed and let the music wash over you

In conclusion, LCD Soundsystem 45:33 and Interpol - Turn On The Bright Lights worked for me this morning