Marx will supply tunes for ABC's music-based drama "The Romeos," which will be penned by Pennette, Brad Meltzer and Steve Cohen.
The hour-long drama, according to the industry paper, will "center on four young men in the 1960s who eventually become the nation's biggest rock stars."
Pennette is also in final negotiations to write the book for a new musical based on the classic animated series "The Flintstones." The Broadway-aimed production about the modern stone age family will feature a score by Marx and Jake Anthony.
The Color Purple's Gary Griffin will direct the new musical, which will be produced by Warner Bros. Theater Ventures.
The plot of The Flintstones, according to Variety, will focus on contemporary issues: "Wilma, for example, mulls leaving Fred because he still acts too much like a caveman and hasn't adapted to more modern ways. Barney and Betty tackle fertility issues before deciding to adopt. Musical will also tackle global warming — but in this case, as The Flintstones takes place before the ice age, the characters will confront 'global cooling.'"