#1 - "From Mars to Sirius" / "Murder of the Universe" with Chris Sherlock Thrown in at the Shallow End

King Gizzard & the Gojira Wizard

Recommendations from Chris:
Death Metal:
Amon Amarth - Twilight of the Thunder God (Viking Metal)
Cynic - Focus (Death Metal with heavy jazz influence)
Dethklok - Dethalbum 1 to 3 or Galaktikon (Same artist, different pseudonym, very tongue-in-cheek)
Opeth - Ghost Reveries
Persefone - Aathma (Really solid Andorran Prog/Melodic Death Metal band, one of my favourites of2017)
Xerath 1 to 3 (Death/Groove with added orchestral parts)

Groove Metal:
Lamb of God e.g. Sacrement
Mastodon e.g. Leviathan
Meshuggah e.g. Catch Thirty-Three
Monuments - The Amanuensis (Born of the "djent" movement like Tesseract, but more focus on groove and melody)

Recommendations from Robert:
King Gizzard & the Lizard Wizard - "Nonagon Infinity" & "I'm in your Mind Fuzz"