The Brave Little Toaster had both Thurl Ravenscroft and Phil Hartman, although Phil’s part was brief (the window-mounted air conditioner).
The junkyard song, IMHO the best in the movie (David Newman and Van Dyke Parks are to be thanked), is “Worthless”. Some sample lines sung by the cars entering the crusher:
“I can’t take this kind of pressure, I must confess one more dusty road would be just a road too long.”
“I just can’t seem to get started, don’t have the heart to live in the fast lane, all that is passed and gone.”
[chorus] “Worthless…and there ain’t nothing I can do about it. Worthless, worthless, worthless”
“Once took a Texan to a wedding, once took a Texan to a wedding, he kept forgetting his loneliness letting his thoughts turn to home and return.”
“I took a man to a graveyard, I beg your pardon, it’s quite hard enough just living with the stuff I have learned.”
“Once I ran the Indy 500 … I must confess I’m impressed that I did it, I wonder how close that I came?”