Slow songs didnt just rock the 80's, it rocked the 90's, 2000's and present day! Usually the rock ballads are what climb the rock charts and move to the pop charts.  Some will say the ballads are a form of selling out or what have you but ballads for me are  a way for the artist to show another side of their talent.  Ballad: A song narrating a story that can be dramatic, funny or romantic,  

Sentimental Ballad: is a more emotional style dealing with romantic intimate relationships.

Power Ballad: an emotional rock song delivered with powerful vocals.

Styx- Babe

Pop Evil- Torn To Pieces

Art Of Dying- Sorry

Aranda- Satisfied

Linkin Park- In The End

Creed - With Arm Wide Open

Metallica- Fade To Black

Godsmack- Under Your Scars

Takida- Silence Calls

Rammstein- Mutter

Sinead O Connor- Nothing Compares To You

Faith No More- Ashes To Ashes

Breaking Benjamin- The Dark Of You

Kutless- Promise Of A Lifetime

Rise Against- Swing Life Away

Sliknot- Snuff

Nickelback- So  Far Away

Coldplay- Scientist