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Whatever Happened to Slade was created on 1977-03-21.
You do yearbook mode and keep doing it and you will get the bonus tracks that or complete some of the goals to get the bonus tracks.
Holiday bonus. Bonus tracks. Bonus features.
17 without the bonus tracks, with the bonus tracks there are 20
Isaac Slade wrote "Say When" and "Happiness". The rest of the tracks were written by both Joe King and Slade.