SparkNet claims rights in Jack and the slogan "playing what we want," but was not successful pursuing its claim recently in Illinois, according to this article:

Not everyone sees things SparkNet's way. Earlier this month, a magistrate judge in U.S. District Court for Northern Illinois ruled in favor of Bonneville International Corp. in a trademark infringement case SparkNet filed. The judge ruled that Bonneville's use of the slogans "whatever we feel like" and "whatever we want" didn't constitute infringement, adding, "This battle is better fought in the marketplace than in the court. ... If every radio station that adopts a slogan containing one or more overlapping words, which describe the music they play, is brought into court, only the lawyers will benefit." 

New report here from www.seattlepi.com.  Earlier report here.