The Jam, "In the City". Their great debut single. I know they were an important band, but honestly, outside of this and "That's Entertainment", I can't think of any of their songs off the top of my head.
Donna Summer, "I Feel Love". Took five tries to get her into the Rock and Roll Hall of Fame, which is four too many. She may not have made my favorite disco record, but she made lots of near-favorites, while most of my favorites made one record of note. Heck, Bruce even wrote a song for her.
Television, "Marquee Moon". Punk hadn't quite solidified in 1977, so I don't think we really noticed this was a ten-minute song with guitar solos. If it came out in 1979, people would have complained.
Fleetwood Mac, "The Chain". Perhaps my favorite Fleetwood Mac song of the post-Peter Green era.
The Brothers Johnson, "Strawberry Letter 23". Originally written and recorded by a teenaged Shuggie Otis in 1971. How time flies department: Shuggie is 64 (so am I, but still).
Kate and Anna McGarrigle, "Southern Boys". They made ten highly-regarded albums, yet I can't think of anything to say about them except that the late Kate McGarrigle was the mom of Rufus and Martha Wainwright.
Judas Priest, "Diamonds & Rust". I saw them open for Led Zeppelin in 1977. There is something fascinating about a metal band, named after a Bob Dylan song, covering a Joan Baez song about Bob Dylan.
Wire, "1 2 X U". As good as punk got in 1977.
The Clash, "Capitol Radio/Janie Jones/What's My Name/Garageland". First they were the greatest punk band. Then they were the greatest band, period. Along with Bruce Springsteen, The Clash got me through a lot of my years working in the factory. And, also along with Bruce and Prince, they were the best live performers I ever saw.