I love listening to songs in another language while I'm working. It makes it easier to concentrate as I can't sing along or listen to the lyrics closely so it forms a lovely background hum instead of distracting me from work.
My favourite foreign language songs currently are by a singer called Luce Tremblay-Gaudette. I absolutely love her and even though I can't understand a single word, the songs are so sweet and happy sounding, they just put me in a good mood. You can listen to her 5 track album here.