1978, a year that saw many big names release albums, including many solo albums, but given it was in the late 70's, a lot of those artists either were just starting out, or following up a few years before, some of their best work.
Rush and Styx oddly, put out 2 of the best albums that year.
Hemispheres, becoming my favorite Rush record among a catalog of 19 proper studio albums. Why that is? to me, it's their peak into doing progressive rock, and when they did it well, there's not many who did it better.
It came out in around Halloween, so it might have hit me like a ton of bricks after the rest of the year.
1978 was the age of Disco and Punk and even New Wave of British Heavy Metal I suppose was coming, so progressive rock and classic rock was fading a bit. A lot of good Jazz-Fusion as well, although not classics really, but still some decent stuff.
1. Rush - Hemispheres
2. Styx - Pieces of Eight
3. Alec R. Costandinos and The Syncophonic Orchestra - Romeo and Juliet
4. Jethro Tull - Heavy Horses
5. Kansas - Two for the Show
6. Renaissance - A Song for All Seasons
7. U.K. - U.K.
8. Bruce Springsteen - Darkness on the Edge of Town
9. Bruford - Feels Good to Me
10. Al Di Meola - Casino
11. Van Halen - Van Halen
12. The Who - Who Are You
13. Yes - Tormato
14. Happy the Man - Crafty Hands
15. The Police - Outlandos d'Amour
16. Genesis - ...And Then There Were Three...
17. Pat Metheny Group - Pat Metheny Group
18. Peter Gabriel - Peter Gabriel (Scratch)
19. Chic - C'est Chic
20. Queen - Jazz
21. Boston - Don't Look Back
22. Talking Heads - More Songs About Buildings and Food
23. Elvis Costello - This Year's Model
24. Alan Parsons Project - Pyramid
25. Steve Hackett - Please Don't Touch
26. Journey - Infinity
27. Dire Straits - Dire Straits
28. XTC - White Music
29. The Rutles - The Rutles

Bruford - Feels Good to Me
rel January 6, 1978

Alec R. Costandinos and The Syncophonic Orchestra - Romeo and Juliet
rel January 16, 1978

Journey - Infinity
rel January 20, 1978

XTC - White Music
rel January 20, 1978

Van Halen - Van Halen
rel February 10, 1978

The Rutles - The Rutles
rel February 24, 1978

Al Di Meola - Casino
rel February 25, 1978

Genesis - ...And Then There Were Three...
rel March 1, 1978

Elvis Costello - This Year's Model
rel March 17, 1978

Pat Metheny Group - Pat Metheny Group
rel March 1978

Renaissance - A Song for All Seasons
rel March 1978

U.K. - U.K.
rel March 1978

Jethro Tull - Heavy Horses
rel April 10, 1978

Max Webster - Mutiny Up My Sleeve
rel April 15, 1978
Steve Hackett - Please Don't Touch
rel May 1978

Kaipa - Solo
rel May 1978

Anthony Phillips - Wise After the Event
rel May 1978

Alan Parsons Project - Pyramid
rel June 1, 1978

Peter Gabriel - Peter Gabriel (Scratch)
rel June 2, 1978

Bruce Springsteen - Darkness on the Edge of Town
rel June 2, 1978

Talking Heads - More Songs About Buildings and Food
rel July 7, 1978

Boston - Don't Look Back
rel August 2, 1978

Chic - C'est Chic
rel August 11, 1978

The Who - Who Are You
rel August 18, 1978

Styx - Pieces of Eight
rel September 1, 1978

Brand X - Masques
rel September 8, 1978

Happy the Man - Crafty Hands
rel September 21, 1978

Yes - Tormato
rel September 22, 1978

XTC - Go 2
rel October 6, 1978

Dire Straits - Dire Straits
rel October 7, 1978

Billy Joel - 52nd Street
rel October 13, 1978

Rush - Hemispheres
rel October 29, 1978

Kansas - Two for the Show
rel October 1978

The Police - Outlandos d'Amour
rel November 2, 1978

Queen - Jazz
rel November 10, 1978

Anthony Phillips - Private Parts and Pieces
rel November 30, 1978

The Doobie Brothers - Minute by Minute
rel December 1, 1978

Chick Corea - Friends
rel 1978

Paco de Lucía - Paco de Lucía interpreta a Manuel de Falla
rel 1978

Eric Johnson - Seven Worlds
rel 1978

John McLaughlin - Electric Guitarist
rel 1978

Annette Peacock - X-Dreams
rel 1978