David Bowie was a genius, but even geniuses have bad days, and 1984’s Tonight was definitely a bad day for the songwriter. Even the most contrarian of Bowie fanatics would have to concede that the album is one of his worst efforts, if not the worst, and that is a sentiment that was shared by the performer himself. To be fair to Bowie, his songwriting muscles were becoming understandably fatigued by the time the mid-1980s rolled around. After est…