I have sonos in my home and love it. You have several options you could get a unit to receive and with built in amp. A integrated unit with speakers and amp built in or the no powered one that is basically like a component that feeds in as a line in source to your apm.
You can listen to pandora radio or other internet radio options with no library. I use my I tunes library and have 1000's of songs.
They are very friendly so call them if you have a question.