The Season One DVD or in syndication.
if by video u mean episode, then the first episode in the simpsons is called "Simpsons Roasting on an Open Fire."
Your question makes no sense as there are no episodes "in" the Simpsons Movie. Are you asking When was the first episode? or When was the first Simpsons Movie? The first episode aired December 17th 1989. The first (& only) Simpsons Movie debuted on July 27th 2007.
Go to WTSO.Net. That's where you can watch almost all of The Simpsons episodesgo on youtube.com and type in simpsons episode...... watevaprobably youtubeiwatchsimpsonsonline.com
There are several episodes of the Simpsons in which Homer sings to Marge. For example, there is the 4th episode of season 14.
http://www.iwatchsimpsonsonline.com/2009/06/watch-simpsons-roasting-on-open-fire.html :-)
13.4 Million households.
It debuted on The Simpsons second episode in 1990, but it was released on the first Simpsons soundtrack in 1997, Songs in the Key of Springfield.
Try the link below.
You can buy it on prime video or watch it on Disney+ if you have it.
Bart of Darkness
Homer's Barbershop Quartet
Homer's Barbershop Quartet