I first saw iDOLM@STER on TV, on a channel that once showed G4TV program re-runs. I think it was G4TV's. The precise show I saw it on was "Cinematech: Nocturnal Emissions".
.....Yeah. When I saw those designs and singing and dancing, I fell in love.
After that, I sought more knowledge about iDOLM@STER. I searched for videos, then more info, until eventually I found the forum, back when it was still (fairly) young. And the rest is in history.
Ah, the good old days......