The controls of the player cannot be operated while a year is being selected.
A shuffle play of all songs begins if none of the songs on the player have a release year
assigned to them.
If all the songs on the player that have a release year assigned have the same release year,
or some of songs have the same release year and the rest of them have no release year
assigned, the animation that appears while release year is being selected is not displayed
and playback starts.
Songs with no release year record are not selected in "Time Machine Shuffle" play and
are not played.