Kai "Hiili" Hiilesmaa (born December 1966) is a Finnish record producer and musician. He is the vocalist of the rock band The Skreppers, former drummer of the doom metal band KYPCK and former keyboardist of the rock band Daniel Lioneye. He has worked with several internationally recognized rock groups, including his near 20-year association with Finnish band HIM.^[1][2][3]

Hiilesmaa began producing music professionally in 1995, recording with such bands as HIM, Amorphis and Apocalyptica. His trademarks include heavy, overdriven guitar sounds and experimental synthesiser programming. In 2013, Hiilesmaa addressed his preference for analog recording, saying "I prefer analog these days. Not only the sound, it asks more attitude to work with analog. Also you must make up your mind faster. There is no 'undo' in analog, which is often good."^[4]

The 69 Eyes

• Devils (2005)
• Angels (2007)

Amorphis

• "Elegy" (1995)
• "My Kantele" (1997)
• "Far from the Sun" (2003)

Ancara

• Chasing Shadows (2009)

Apocalyptica

• Inquisition Symphony (1998)
• "Cult" (2000)

Eilera

• Precious Moment (2005)
• Fusion (2007)

HIM

• 666 Ways to Love: Prologue (1996)
• Greatest Love Songs Vol. 666 (1997)
• Love Metal (2003)
• And Love Said No: The Greatest Hits 1997–2004 (2004)
• Venus Doom (2007)
• Shatter Me with Hope (Sword of Democles version) from the "Heartkiller" CD single (2010)
• "XX – Two Decades of Love Metal (2012)
• Tears on Tape (2013)

Lordi

• "The Monsterican Dream" (2004)

Moonspell

• Darkness and Hope (2001)
• The Antidote (2003)

Poisonblack

• Of Rust and Bones (2010)

Ruoska

• Rabies (2008)

Samantha Scarlette

• Violent Delights + Violent Ends (2014)^[5]

Sentenced

• "Crimson (1999)
• "The Cold White Light" (2002)
• "The Funeral Album" (2005)