/*
* Return information about a specific song in the playlist.
*
* This method raises an Xmms::Error exception if XMMS is not running.
*
* Examples:
* title, file, time = remote[45] # get info about the 45th song
* info = remote.get_entry 45 # get info about the 45th song
*
*/
static VALUE xr_pl_ary(VALUE self, VALUE pos) {