The Box (formerly Video Jukebox Network, The Jukebox Network)Sing Along With Mitch - During 1960-66, (including re-runs), Mitch Miller lead a sing-a-long with the TV audience.
Smell-O-Vision - Though primarily a theater experieince, in 1995, smells were offered as a compliment to the TV Program.
Talkback To Showtime - 1981, Viewers dialed a 900 number for viewer interaction. See the
itvt.com story.
WebTV
for Windows
It's reported that Todd Rundgren in 1978 gave the first interactive
television concert by broadcasting live over the Warner/QUBE system in
Columbus, Ohio (the home audience chose each song in real time during
the concert by voting via QUBE’s 2-way operating system). (
Reference.)