An objective of the compulsory license is to ensure that a listener's experience is similar to traditional radio and essentially non-interactive (i.e., you can't hear a specific song when you want it), so as not to substitute for music purchase.
Hence, the rules of the compulsory license require that the sequence of playback cannot be pre-determined by a listener, and the listener may also not know what song he or she will hear next (i.e., no pre-announced playlist). Accordingly, a user cannot see the all of the songs included within a playlist at the outset and then fast-forward or rewind to songs of interest (which would make the service interactive). Similarly, there are limits on (a) the number of songs that can be included from any one artist or any one album on a given channel or playlist within a 3-hour period, and ( the number of tracks that can be skipped per hour on a given channel.