Control Rhythmbox's play queue via Helm. Start by calling `helm-rhythmbox' to browse the library retrieved from a running Rhythmbox instance via D-Bus. The default action is to play the selected song. There is also the option to enqueue the selected song, this also works for a selection. The whole library is retrieved on first use and can be reloaded with `helm-rhythmbox-reload-library'. Note that candidates formatted with `helm-rhythmbox-candidate-format' are cached, so to see the effect of changing `helm-rhythmbox-candidate-format' (after already having loaded the library) requires reloading the library to reset the cache.