3. 3 0PM/ 7. 3 0PM, S HOWCASE Martin Scorsese’s premiere episode wasn’t great: full of people being unpleasant at high volume. But the series became a compelling drama filled with insight into the New York music biz of the ’70s. Tonight’s finale sees Zak (Ray Romano) mapping out a plan to bring down Richie (Bobby Cannavale). Despite poor US ratings, it’ll get a second season.