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 Issa Rae, known for her work on "Insecure," is an executive producer (and key figure) in the new two-part documentary, "Seen & Heard: The History of Black Television," premiering Tuesday on HBO and streaming on HBO Max. Presented as a film by Giselle Bailey, with directing credits shared with Phil Bertelsen, it doesn't offer a comprehensive account: any viewer who has watched much television over the medium's decades-long history might have an opinion on what's missing. But what's on offer here is always interesting, elegantly produced, sometimes thrilling, often poignant.  Young viewers, whose historical and cultural interests may not extend beyond their own births, may be surprised, but even those of us who remember a time before "Julia" can learn a thing or two. Stars: Tyler Perry, Issa Rae, Debbie Allen The first episode, "Seen," begins with Tracee Ellis Ross and Anthony Anderson in the green room waiting to appear on ...