After finding loads of gems asking what the best music to fall asleep to is, how about for working. Main thing for me is that I can have it on in the background and it won't stop me from concentrating on the work - mine often have no lyrics, definitely no loud climaxes.

I like Kruder & Dorfmeister stuff, Boards of Canada, Brian Eno, Thievery Corporation etc. also some Do make say think, labradford...