They started dating in the episode-"Rules of Engagment" which is in the third season, episode 14.
That would be "Over a Barrel" Season 1, Episode 21. She sings it before the ponies and buffaloes start a fight. She sings it, because she's talking about sharing land. The buffaloes want to stampede through their land, but the ponies don't want them to, because they don't want them ruining their orchards that they grew there.
Season 1, Episode 1
"The Fire" episode 4, season 2
Seddie will happen on a episode named iOMG in the last episode of Season 4. Then in Season 5 they will start to date.
Season Six Season six just ended they will start season 7 on September 23 2010
episode 161 the start of season 6
Well the episode there come is season 3
He is first seen in the episode 'Never Been Kissed' which is Season Two, Episode Six. They start dating in the episode 'Original Song' which is Season Two, Episode Sixteen.
half of season 3 is called season 4!(for some confusing reason!)-end of season 3 episode 13/26 start of season 4 episode 14/26 end of season 4 episode 26/26!
Season 2 episode 17
The artist is Gram Rabbit and the song is called Bloody Bunnies. Look it up here http://www.youtube.com/watch?v=ItG8vsCGeKE Grtz Mephirox