Music that is too enjoyable seems to take over the creative part of the brain. Try to do some deep focus work with your favorite music playing; impossible. Now, if you are doing a repetitive task, then that type of music is perfect. Creative energy gets sapped by any music you enjoy too much.

I've also heard that interpersonal intimate relations (lol, sorry) also will sap creative energy.

I'd also agree with others that a constant noise is much better than random/surprising noises as far as being able to ignore it. People bursting out in laughter in the office is definitely surprising noise, so are phones ringing and someone knocking on the door.