Question: What do both Aealo and Rotting Christ have in common?

Context paragraphs:
Aealo: Aealo is the tenth full-length album by Greek extreme metal band Rotting Christ.  It was released on 15 February 2010 via Season of Mist.

Non Serviam (album): Non Serviam is the second full-length album by Greek extreme metal band Rotting Christ, released in 1994.

Passage to Arcturo: Passage to Arcturo is the first EP by Greek extreme metal band Rotting Christ, released in 1991.  It was originally an MLP-pressing only: first edition in gatefold cover; second edition with normal cover.  The EP was re-released in February 2011 with "The Old Coffin Spirit (Live)", "The Mystical Meeting (Live)" and "The Forest of N'Gai (Live)" as bonus tracks on MCD.

Triarchy of the Lost Lovers: Triarchy of the Lost Lovers is the third full-length album by Greek extreme metal band Rotting Christ.  This album was released in April 1996 on Century Media and was the first album to showcase a steady addition of gothic metal influence to their overall sound.

Bio-Cancer: Bio-Cancer have toured with several popular metal acts such as Sodom, Onslaught, Rotting Christ, Xentrix, Artillery, and Marduk.  The band's musical style has been compared to that of other underground Greek bands Flames, Acid Death, Suicidal Angels, and Insidead, as well as other bands such as Sodom, Kreator, Testament, and Shrapnel.  "Brave Words & Bloody Knuckles" noted that Bio-Cancer mixes elements of Teutonic thrash metal with elements of Bay Area thrash metal, and that Lefteris uses some speed metal and black metal style vocals that add some variety to the band's sound.  Metal.de compared Lefteris's vocals style to those of Chance Garnette of Skeletonwitch.

Jens Bogren: Jens Peter Daniel Bogren is a record producer, mixer and recording engineer who has worked on albums by Opeth, Dimmu Borgir, Sepultura, Arch Enemy, At The Gates, Katatonia, Babymetal, Soilwork, James LaBrie, Moonspell, God Forbid, Kreator, Devin Townsend, Ihsahn, Dark Tranquillity, Paradise Lost, Amon Amarth, Dragonforce, The Ocean, Haken, Rotting Christ, Symphony X, Myrath, Angra and Dir En Grey amongst others.  Bogren lives in Örebro, Sweden and is based at Fascination Street Studios.

Rotting Christ: Rotting Christ is a Greek extreme metal band formed in 1987.  They are noted for being one of the first black metal bands within this region, as well as a premier act within the European underground metal scene.  They are also responsible for creating the signature Greek black metal sound prevalent in the early 1990s.

Sanctus Diavolos: Sanctus Diavolos is the eighth full-length album by Greek extreme metal band Rotting Christ.

Thy Mighty Contract: Thy Mighty Contract is the first full-length album by Greek extreme metal band Rotting Christ, released in late 1993 on Osmose Productions.

The Sum of All Fears (album): The Sum of All Fears is the second album by Italian black metal group Cultus Sanguine, released in 1999 by the French independent label Season of Mist (who have bands such as Mayhem and Rotting Christ on their roster.

Supporting paragraphs: Aealo Rotting Christ
Answer: Greek extreme metal band