Certainly in England the PRS (performing right society) will attempt to collect money to licence music if you're a small business playing music only to employees.
> Workers/colleagues and/or customers/clients have been recognised by the courts as falling within the composer's ‘public’. Any person wishing either to play or to authorise the playing of our music to such individuals in the workplace - wherever that workplace is situated - should therefore obtain a music licence.
http://www.prsformusic.com/users/businessesandliveevents/Pag...
Especially http://www.prsformusic.com/users/businessesandliveevents/Pag...
> Workers/colleagues and/or customers/clients have been recognised by the courts as falling within the composer's ‘public’. Any person wishing either to play or to authorise the playing of our music to such individuals in the workplace - wherever that workplace is situated - should therefore obtain a music licence.