White dwarf binaries are expected to be the most numerous sources in LISA. Models predict that about 10 000 sources will be

individually resolved and that millions of others will combine into an unresolved foreground.  The shape and amplitude of the background

as well as the orbital frequencies of the individual detections will be very informative on the evolution of low mass binary stars and also the

shape of the Milky Way. It was recently shown that extragalactic white dwarfs will also create a background. In thediscussion I will show what

we currently know about these signals and how their combined information can help us understand binary evolution.