Groundbreaking albums. Any genre.

Not necessarily the very best but those that opened up a new direction and influenced many.
Miles Davis - Bitches Brew
John McLaughlin with Mahavishnu Orchestra - Inner Mounting Flame
Pink Floyd - Dark Side Of The Moon
Dead Can Dance - Spleen and Ideal
John McLaughlin/Paco de Lucia/Al di Meola - Friday Night in San Francisco 
Deep Purple - Machine Head
.....King Crimson-In the court,
Stevie Wonder-Songs in the key if life,
The Byrds-Fifth Dimension, 
Michael Jackson-Thriller,
Pink Floyd-DSOTM,.......


Terry Riley’s A Rainbow in Curved Air. 
Talk Talk’s Spirit of Eden. 
Both of those changed expectations of what recorded sound should sound like. 
The Melvins
mekong delta
sex pistols

For me the biggest ones are...

 Mekong delta for the thrash/prog metal, groundbreaking band. Fates warning close second. (More of a power metal w prog influence. 
 Bathory s/t LP.   Bathory spawned 2 genres (I despise the genre thing, as me in the early 80’s  it was either metal, or it wasn’t.) this album changed music forever. 
Venom -welcome to hell.  INFLUENCED BY MOTÖRHEAD, this release influenced about every metal band since.   Release date I think was Dec. 1, or 2, or 3, I do remember it was the first week of December. 1981, this slab of unholiness was released and people flipped out, as did I. Still a personal fav, this album changed music forever.

paul Samson,  Paul and Paul alone single handily started the amazing NWOBHM scene.  Arguably, I’m a huge fan of the British scene, and the dates of Samson’s releases predate much of the so called NWOBHM movement.     Lots of singles and bands were also a huge part of this British influence. 
 Either way, I’m so glad to be a part of the start of metal, the decline, and the rebirth!

long live metal!

"Deep Purple - Machine Head"

Is is possible to play that album  low volume? Space Truckin- I think not.